Best eSIM for Japan 2026 - Tourist Data Plans Compared

Best eSIM Providers for Japan

eSIM plans in Japan at a glance

How well each provider's eSIM works in Japan

The Vefru score is our overall rating of the provider. The percentage shows how many reviewers said their eSIM worked well in Japan. Since unhappy customers review more often, it is best used to compare providers with each other.

8.1Our score

Worked well in Japan

36 of 37 reviewers

97%

Visit website Detailed review

7.1Our score

Worked well in Japan

23 of 24 reviewers

96%

Visit website Detailed review

7.1Our score

Worked well in Japan

64 of 68 reviewers

94%

Visit website Detailed review

6.1Our score

Worked well in Japan

76 of 81 reviewers

94%

Visit website Detailed review

7.5Our score

Worked well in Japan

92 of 99 reviewers

93%

Visit website Detailed review

6.9Our score

Worked well in Japan

75 of 81 reviewers

93%

Visit website Detailed review

7.2Our score

Worked well in Japan

158 of 171 reviewers

92%

Visit website Detailed review

8.4Our score

Worked well in Japan

84 of 93 reviewers

90%

Visit website Detailed review

6.3Our score

Worked well in Japan

1092 of 1210 reviewers

90%

Visit website Detailed review

7.1Our score

Worked well in Japan

118 of 131 reviewers

90%

Visit website Detailed review

8.0Our score

Worked well in Japan

21 of 30 reviewers

70%

Visit website Detailed review

7.8Our score

Worked well in Japan

12 of 16 reviewers

75%

Visit website Detailed review

6.6Our score

Worked well in Japan

9 of 12 reviewers

75%

Visit website Detailed review

8.8Our score

Worked well in Japan

1 of 2 reviewers

50%

Visit website Detailed review

Compare all eSIM plans in Japan

How we got these numbers: we read 2055 public customer reviews that mention Japan or a place in it, published between July 2023 and August 2026, and counted a report as "worked" when the reviewer said the eSIM connected, even with small hiccups. We treat 20 or more reports as strong evidence, 3 to 19 as limited, and fewer than 3 as too few to judge. A count like 36 of 37 means the eSIM worked well for 36 of the 37 travelers who reported from here; each provider section says what went wrong for the rest. The Vefru test score is a separate number: our own hands-on test of the provider, run outside Japan, so it says how the provider behaves, not how the network performs here. Local operator prices in the text were checked on 25 Sep 2026; provider ratings, the plan tables and the price-per-GB chart are live and update on their own.

The Best group is the five providers with the best records in Japan among those with 3 or more reports, ordered by how many travelers they worked for, then by price position, then by what we found in our own tests, plus eSIM4Travel, which earns its place on price and on our hands-on test rather than on Japan reports.

Saily eSIM in Japan: best record, best help desk

8.1 /10

Vefru score Excellent Score details

• Purchase process7/10
• Mobile app9/10
• eSIM installation9/10
• Customer support10/10
• Speed test8/10
• Prices4/10
• Customer feedback9.4/10
• Coverage8/10

Average of eight categories from our own paid test and customer reviews.

Saily is the travel eSIM from the company behind NordVPN, with plans for about 200 destinations. It has the smoothest install we have tested, a polished app and a built-in VPN. But prices run above the market in most big European destinations, and traveler reports sit below average.

Key facts

• About 200 destinations
• iPhone app 4.7
• Android app 4.5
• Top-ups
• Hotspot
• 3 or 5 GB/day cap

Trustpilot

4.7/531,741 reviews

Payments

Credit or debit cardApple PayGoogle Pay

Pros and cons

Pros 4 Cons 4

Easiest install we've tested

Fast 24/7 human support

Free VPN and ad blocker

Plan starts only when you land

Pricey in big European countries

App required, no eSIM by email

Less reliable than average

App stops when your data runs out

Saily eSIM in our hands

Go to Saily website View full review

Saily is our pick for most trips to Japan because it combines the best record of any provider here with the best app and help desk we tested. It worked well for 36 of 37 travelers who reported from Japan (97%), which is strong evidence. The successes describe Tokyo, Kyoto and Osaka, a first-time setup that took minutes, and data that kept going when companions on other eSIMs dropped out. One reviewer wrote on 18 Jun 2026: "I had no connectivity issues in Tokyo and Kyoto even when those using other systems lost connection."

The one miss was a phone that never connected, a Samsung Galaxy S24 FE, and Saily refunded it. Two more reports count as working but are worth reading: a traveler in the Osaka area in June 2026 found the speed inconsistent and at times unusable even with full signal on an iPhone 12 Pro, and a traveler landing at Narita in April 2026 had no data until the in-app chat walked them through the settings. That chat is the point: in our own test Saily's help desk went from bot to a real person fast and solved the problem, and the install is done inside the app with no QR code, which is why we send first-time eSIM users here. Our Saily review has the screenshots.

Saily's page names KDDI and SoftBank as its Japanese networks. In our comparison tool its Japan plans run from 1 GB for 7 days through 3, 5, 10 and 20 GB for 30 days to unlimited for 15 or 30 days, and Saily publishes the unlimited rule: 5 GB a day at full speed, then slowed until midnight. An Asia and Oceania plan and a Global plan also cover Japan, useful if you add South Korea or Thailand. The plan starts on first connection and waits up to 180 days after purchase, so install at home. Drawbacks: Saily sits above the market average on price in Japan and is among the dearest providers in many popular destinations, the plan is data-only unless you add its US number, and the app stops working once the data is gone, so top-ups need Wi-Fi.

Roamless eSIM in Japan: one eSIM, many countries

7.1 /10

Vefru score Very good Score details

• Purchase process5/10
• Mobile app7/10
• eSIM installation7/10
• Customer support7/10
• Speed test8/10
• Prices5/10
• Customer feedback9/10
• Coverage9/10

Average of eight categories from our own paid test and customer reviews.

Roamless is a US provider built around one global eSIM for 203 destinations, paid with pay-as-you-go credit. It was fast and unthrottled in our test, and travelers report it working in 91% of cases. Its weak point is buying: the website forces you into the app, and large data amounts cost more than most rivals.

Key facts

• 203 destinations
• iPhone app 4.8
• Android app 4.1
• Pay-as-you-go
• Unlimited hotspot
• No throttling

Trustpilot

4.5/51,746 reviews

Payments

Credit or debit cardApple PayGoogle Pay

Pros and cons

Pros 4 Cons 4

One eSIM for 200+ destinations

Fast, no throttling

Worked for 91% of travelers

Free 500 MB trial

Website pushes you into the app

We had to fix the APN to get data

Credit can expire after 12 months

Pricey for 10 GB and up

Roamless eSIM in our hands

Go to Roamless website View full review

Roamless is the pick for travelers who combine Japan with South Korea, Thailand or a longer Asia loop and use little data, because one eSIM and one credit balance cover every country and the balance does not expire. It worked well for 23 of 24 travelers who reported from Japan (96%), strong evidence. The successes run the length of the country: Tokyo to Fukuoka, Sapporo and Kyushu, and several reviewers used the same eSIM in Korea, Thailand, Qatar or Australia on the same trip. A reviewer wrote on 27 Nov 2025: "Worked great while travelling in Japan, from Tokyo to Fukuoka."

The one miss was a traveler who thought the eSIM had connected at Narita in October 2025 and found outside the airport that it had not. Two reports that count as working describe the same first-connection trouble: one waited more than an hour for data in December 2025, and one on a Samsung Galaxy S22 in March 2026 got only 3G-like speeds on KDDI until the phone was reset. We hit the same wall in our test: the preselected APN did not work and a manual network switch was needed before data flowed, which is why Roamless lost points for installation in our Roamless review. Once connected, our speed test showed no throttling.

Roamless does not name a Japanese network on its page (checked September 2026); our comparison tool lists its Japan plans as KDDI. Those plans run from 0.5 GB to 200 GB with 30-day validity or no expiry at all, next to pay-as-you-go credit, an Asia and Oceania plan and a Global plan, and a free Japan trial plan appears in our tool too. There is no unlimited plan. The app has in-app calling and an optional second number, and at zero balance a trickle of data stays on so you can top up without Wi-Fi. On price Roamless sits at the market average in Japan: among the cheapest for 1 GB, dear from 10 GB up, so heavy users should look at ByteSIM or eSIM4Travel instead.

GigSky eSIM in Japan: Visa plans, 4G only

7.1 /10

Vefru score Very good Score details

• Purchase process7/10
• Mobile app6/10
• eSIM installation8/10
• Customer support9/10
• Speed test6/10
• Prices4/10
• Customer feedback8.6/10
• Coverage8/10

Average of eight categories from our own paid test and customer reviews.

GigSky is a US travel eSIM that works like its own operator, with plans for 190+ destinations plus cruise, ferry and in-flight plans. Its app stays partly online after your data runs out. But its fixed-data plans are the most expensive of the 12 providers we compared.

Key facts

• 190+ destinations
• iPhone app 4.5
• Android app 3.9
• Top-ups
• Hotspot
• 3.5 GB/day cap

Trustpilot

4.3/57,194 reviews

Payments

Credit or debit cardApple PayPayPal

Pros and cons

Pros 4 Cons 4

Buy more data even with none left

Cruise, ferry and in-flight plans

Human support answered right away

Cheap 1-day unlimited passes

Most expensive per GB we track

App required, no Google Pay

Clunky, web-like app

Less reliable than average

GigSky eSIM in our hands

Go to GigSky website View full review

GigSky is the pick for Visa cardholders, who get free Japan plans through the app, and for cruise and ferry stops, because its app keeps working after the data runs out. It worked well for 64 of 68 travelers who reported from Japan (94%), strong evidence, and a large share of those reports came from people on the free Visa plans. The successes describe Osaka, Hokkaido, Kyoto, Hiroshima and Tokyo, rural routes, and the status bar showing "au". One reviewer wrote on 19 Aug 2026: "I used at Japan (Osaka and Hokkaido) and connections were very reliable."

The four misses were all in Tokyo: weak one-bar signal in Shinjuku in June 2026 while a docomo-based eSIM on the same trip held full bars, a connection that stopped in the Harumi area in March 2026, no signal at Tokyo DisneySea, and a one-day outage. Several working reports add that data was 4G/LTE only, never 5G, and that the first connection at the airport took longer than with Airalo. Visa plans cannot be topped up and do not cover cruise ships, so a paid plan is needed for those.

GigSky's own pages disagree on its Japanese network (one says NTT docomo, another docomo and SoftBank), so we could not confirm it. In our comparison tool its Japan plans run from 1 GB to 10 GB plus unlimited, for 1 to 30 days, with an Asia Pacific plan and cruise plans on top. The free plans need the app, and the app is the only way to buy; in our test it was a wrapped website, but it stayed partly online at zero data, which only Ubigi matched, as our GigSky review shows. The drawback is price: GigSky is the most expensive fixed-data provider in our comparison overall and sits above the market average in Japan, so without a Visa card it is a safe pick, not a cheap one.

ByteSIM eSIM in Japan: unlimited data, Japanese IP

6.1 /10

Vefru score Good Score details

• Purchase process4/10
• Mobile app4/10
• eSIM installation7/10
• Customer support2/10
• Speed test8/10
• Prices5/10
• Customer feedback9.6/10
• Coverage9/10

Average of eight categories from our own paid test and customer reviews.

ByteSIM is a Hong Kong eSIM shop with a huge catalog: daily, fixed and unlimited plans for about 200 destinations. Data was fast in our test, and travelers report it working in 88% of cases. The checkout, the app and support were the weak points.

Key facts

• About 200 destinations
• iPhone app 4.6
• Android app 3.8
• No top-ups
• Hotspot
• 175 Mbps on 4G

Trustpilot

4.8/54,279 reviews

Payments

Credit or debit cardApple PayGoogle PayPayPal

Pros and cons

Pros 4 Cons 4

Cheap for 3–5 GB short trips

Fast 4G, no throttling

Worked for 88% of travelers

180 days to get a refund

Checkout asks for phone and address

Clunky app, auto-activation failed

Promises 5G, gave us only 4G

Support didn't reply in our test

ByteSIM eSIM in our hands

Go to ByteSIM website View full review

ByteSIM is the pick for unlimited data on a single Japanese network with a Japanese IP address, which keeps Japanese apps and streaming services from treating you as abroad. It worked well for 76 of 81 travelers who reported from Japan (94%), strong evidence. The successes describe trips from Tokyo down to Okinawa, 5G most of the time, families on several eSIMs at once, and WhatsApp support that answered within minutes. A reviewer wrote on 30 Aug 2024: "Worked great from Tokyo down to Okinawa."

The misses cluster around two things. Speed: a traveler on the 5G Ultra Unlimited plan in October 2025 found it average to very slow in Osaka, Kyoto, Shinjuku, Shibuya and Akihabara, and an earlier reviewer in May 2024 lost data in crowded areas. Validity: ByteSIM counts days from midnight Japan time, so a plan bought for an evening arrival loses a day, which confused reviewers in October 2024 and July 2026. A few reviewers needed APN or activation help on specific phones, and one older complaint from March 2024 described a throttle after 1 GB on a plan that no longer appears in our tool. Support in those reviews was fast; in our own test nobody answered our WhatsApp message in 15 minutes.

ByteSIM has the biggest Japan catalog in our comparison tool: daily plans from 500 MB to 10 GB a day, fixed plans from 3 GB to 300 GB, a daily "Japan Unlimited Data" plan and the "5G Ultra Unlimited eSIM by KDDI" for 7, 10, 15 or 31 days, all for 1 to 31 days. Its page names KDDI and SoftBank for the dual-network plans and KDDI alone for Ultra Unlimited; it publishes no fair-use cap for that plan, and we could not confirm that there is none. There are no top-ups, so buy the size you need. On price ByteSIM sits a little below the market average in Japan. The drawbacks are the checkout, which asked us for a phone number and postal address, and an app that failed to auto-install in our ByteSIM review, so it suits people who have installed an eSIM before.

Airalo eSIM in Japan: calls, texts, easy start

7.5 /10

Vefru score Very good Score details

• Purchase process9/10
• Mobile app8/10
• eSIM installation9/10
• Customer support7/10
• Speed test7/10
• Prices5/10
• Customer feedback8.2/10
• Coverage7/10

Average of eight categories from our own paid test and customer reviews.

Airalo is an eSIM marketplace from Singapore with plans for 200+ destinations, some with calls and texts. It is easy to buy and install. But prices sit at the market median, and travelers report more failed connections than with any other provider we track.

Key facts

• 200+ destinations
• iPhone app 4.6
• Android app 4.3
• Top-ups
• Hotspot
• No cap on fixed plans

Trustpilot

4.1/545,721 reviews

Payments

Credit or debit cardApple PayGoogle PayPayPal

Pros and cons

Pros 4 Cons 4

Buy on the web, no app needed

Works right after install

Fast, no speed cap on fixed plans

Most plans with calls and texts

Average prices, not cheap

Lowest success rate we track: 72% worked

App stops when your data runs out

Clunky checkout, no QR download

Airalo eSIM in our hands

Go to Airalo website View full review

Airalo is the pick for travelers who want a plan with calls and texts, or who want the biggest brand with the simplest purchase, and Japan is one of its good countries: it worked well for 92 of 99 travelers who reported from Japan (93%), strong evidence, against the weakest record of all 14 providers across every country. The successes describe Osaka, Kyoto, Tokyo, Awaji Island and Hokkaido, data on the moment of landing, and easy top-ups in the app. One reviewer wrote on 16 Aug 2026: "Travelled in the different tourist spots in Hokkaido and don't have a problem with the signal."

The seven misses have dates. On 24 Jun 2026 Airalo's service went down for about half a day, and several reviewers in Japan that week described no data and a support desk that could not say when it would return. A traveler in downtown Fukuoka in June 2026 found no coverage. In August 2026 one reviewer found their traffic routed through Hong Kong, which blocked some social media apps. Earlier misses describe slow data, an activation that took 30 to 45 minutes after landing, and a couple whose 3-day plans never worked at all. The pattern is outages and routing, not dead zones.

Airalo's Japan page names SoftBank first and "one other" network (as of September 2026); our comparison tool lists its Moshi Moshi plans as SoftBank. Those plans run 1, 3, 5, 10 and 20 GB plus unlimited, for 3 to 30 days, and Airalo's own plan terms slow the unlimited plan after 3 GB a day. The calls come from its regional Asialink, Discover and Discover+ plans, which cover Japan with minutes, texts and a US number. Purchase and install were the easiest in our test, with no settings to touch, as our Airalo review shows. Drawbacks: Airalo sits above the market average on price in Japan and is never the cheapest in a popular destination, some packages start on install rather than first connection, and the app dies at zero data.

eSIM4Travel eSIM in Japan: cheapest, human help desk

8.8 /10

Vefru score Excellent Score details

• Purchase process8/10
• eSIM installation8/10
• Customer support10/10
• Speed test8/10
• Prices10/10
• Customer feedback8.8/10
• Coverage9/10

Average of seven categories from our own paid test and customer reviews. eSIM4Travel has no app, so we do not score one.

eSIM4Travel is a US eSIM seller with plans for 158 destinations and no app. It was the cheapest provider in our price database, and its support was the best we have tested. Without an app, you cannot reach the store to top up once your data runs out.

Key facts

• 158 destinations
• No app
• Web only
• Top-ups
• Hotspot
• No throttling

Trustpilot

4.4/5202 reviews

Payments

Credit or debit cardPayPalApple Pay

Pros and cons

Pros 4 Cons 4

Cheapest provider we track

Quick, helpful human support

Fast, no throttling

Website in 41 languages

No app: out of data, you need Wi‑Fi to top up

US dollars only, no Google Pay

Unlimited slows after 3 GB a day

No refund after 10% of data used

eSIM4Travel eSIM in our hands

Go to eSIM4Travel website View full review

eSIM4Travel is in the Best group for its price, the lowest in our comparison for Japan by a wide margin, and for the help desk that scored best in our test, not for its Japan record: only 2 travelers have reported from Japan so far, and the eSIM worked well for 1 of them, which is too few to judge. The success was a 10 GB plan used in Tokyo. The miss, in March 2025, was poor reception after three days on two phones, an iPhone and an Android, and support that was busy; the couple switched to Saily. eSIM4Travel's reply to that review says it sells a KDDI-only plan and a SoftBank plus KDDI dual-network plan for Japan and recommends the dual one where a single network is weak.

In our own test, run in Switzerland, the eSIM installed from a QR code and worked right away, and the chat went from bot to a real person in one click, who fixed the issue and suggested switching network. There is no app: you buy on the website, get the QR by email and manage the plan in the browser, which our eSIM4Travel review walks through. The downside of no app is that once the data runs out you cannot reach the store without Wi-Fi. No Google Pay either, and the card is typed by hand.

eSIM4Travel's homepage names KDDI and SoftBank as its Japanese networks. Our comparison tool shows two Japan plan families: "Japan (Softbank, KDDI)" from 1 GB to 50 GB, and a "Japan (DOCOMO Local Network)" family of similar sizes, plus an unlimited plan slowed after 3 GB a day according to third-party listings, for 1 to 30 days. A Global plan and a South East Asia plan also cover Japan. For a traveler on a budget who installs at home over Wi-Fi, this is the lowest-cost option here; for anyone who may need to top up on the road, Saily or Roamless is the safer choice.

Other eSIM Providers for Japan

We tested all eight providers below and every one of them sells a plan that covers Japan. They sit here because their Japan record is a little weaker than the Best group's, because a finding in our own test counts against them (a capped speed, support we could not reach), or because their reports from Japan are too few to rank them. Three of them, Nomad, Ubigi and Holafly, have more Japan reports than most of the Best group, so read their sections before you decide.

Jetpac eSIM in Japan: calls and lounges, rough app

6.9 /10

Vefru score Good Score details

• Purchase process5/10
• Mobile app5/10
• eSIM installation9/10
• Customer support5/10
• Speed test8/10
• Prices5/10
• Customer feedback9.4/10
• Coverage9/10

Average of eight categories from our own paid test and customer reviews.

Jetpac is a Singapore eSIM provider with plans in 129 countries. It adds extras like in-app calls, free WhatsApp and Google Maps after your data runs out, and lounge access on delayed flights. Its website, app and support are rough, so it suits travelers who can fix small issues themselves.

Key facts

• 129 countries
• iPhone app 4.0
• Android app 4.1
• Top-ups
• Hotspot
• 3 GB/day cap

Trustpilot

4.7/53,528 reviews

Payments

Credit or debit cardApple PayGoogle Pay

Pros and cons

Pros 4 Cons 4

WhatsApp and Maps keep working without data

Unlimited hotspot

Cheap calls in the app

Free lounge if your flight is late

Slow website, confusing checkout

No top-up once your data runs out

Slow, technical support

Pricey for 3–20 GB

Jetpac eSIM in our hands

Go to Jetpac website View full review

Jetpac is a reasonable choice for frequent flyers who want voice packs, free WhatsApp and Maps after the data runs out, and a lounge pass when a flight is delayed, but it is not a top pick because its app and website were the roughest we tested and it does not name its Japanese network. It worked well for 75 of 81 travelers who reported from Japan (93%), strong evidence. The successes describe Hokkaido to Tokyo on one 30 GB pack, Okinawa and smaller islands, rural 4G and city 5G. The six misses were drops across Shikoku, no service in Nagoya, slow data in Takayama and Gero, slow uploads, traffic routed through Hong Kong, and one three-day problem that support never solved.

In our comparison tool Jetpac sells Japan packs from 1 GB to 40 GB plus unlimited, for 1 to 30 days, and APAC and Global packs; its unlimited plan gives 3 GB per 24 hours at full speed, then slows. Its Japan page did not name a network when we checked (a third party reports KDDI), and a regional plan in our tool is listed as KDDI and Rakuten for Japan. On price Jetpac sits above the market average in Japan. Our Jetpac review found a slow site with misleading buttons, a usage counter that lagged, and data that dropped until the physical SIM was switched off, so it suits people who value the extras over polish. The eSIM arrives by email and can be installed at home. Jetpac keeps unactivated packs for three months.

Nomad eSIM in Japan: Tokyo drops, unreachable support

7.2 /10

Vefru score Very good Score details

• Purchase process8/10
• Mobile app7/10
• eSIM installation8/10
• Customer support2/10
• Speed test8/10
• Prices7/10
• Customer feedback8.6/10
• Coverage9/10

Average of eight categories from our own paid test and customer reviews.

Nomad is a US travel eSIM brand run by LotusFlare, with plans for more than 200 destinations. It has a polished native app, fast data and prices close to the market average almost everywhere. Its weak spot is support: the chat is an AI bot with no route to a human.

Key facts

• 200+ destinations
• iPhone app 4.8
• Android app 4.5
• Top-ups
• Hotspot
• 2 GB/day cap

Trustpilot

4.3/544,625 reviews

Payments

Credit or debit cardApple PayGoogle PayPayPal

Pros and cons

Pros 4 Cons 4

Quick, easy purchase

Great app with a data widget

Fast, full-speed data

Fair prices almost everywhere

Support is a bot, no human

Easy to lose the install button

App stops when your data runs out

No refund after install

Nomad eSIM in our hands

Go to Nomad website View full review

Nomad has the second-largest Japan record in this article and a good app, but it is not a top pick because its misses sit in Tokyo and because our test found no way to reach a human at its help desk. It worked well for 158 of 171 travelers who reported from Japan (92%), strong evidence. The successes describe Hokkaido ("very stable connection all throughout Hokkaido and Tokyo", 12 Aug 2026), Tohoku, Ishikawa and Gifu, a Shikoku and Kyushu road trip, and data on landing. The 13 misses describe drops in central Tokyo in June and July 2026 (one reviewer had service about a third of the time), slow data with full 5G bars, no signal on highways around Osaka and Hiroshima, an unstable countryside connection, apps blocked because traffic left Japan through Singapore or Hong Kong, and a Global-EX plan that does not include Japan. Several reviewers fixed a lost connection after Wi-Fi with airplane mode on and off.

Nomad's page names KDDI au and SoftBank, and says the network varies by plan; our comparison tool lists its Japan plans as KDDI au or SoftBank. The plans run from 1 GB to 50 GB plus a Local Japan unlimited plan for 3, 7, 14 or 21 days, next to APAC and China-Japan-Korea regional plans and a free 1 GB trial. The unlimited plan slows after its daily allowance. The plan waits 60 days for first connection. On price Nomad sits a little below the market average in Japan. In our Nomad review the bot looped on an APN question and timed out, so Nomad suits experienced users who will not need help, above all outside Tokyo.

Maya Mobile eSIM in Japan: global unlimited, no Japan plan

8.4 /10

Vefru score Excellent Score details

• Purchase process9/10
• Mobile app8/10
• eSIM installation9/10
• Customer support6/10
• Speed test9/10
• Prices8/10
• Customer feedback9/10
• Coverage9/10

Average of eight categories from our own paid test and customer reviews.

Maya Mobile sells one product: a global unlimited eSIM plan for 165+ countries that you install once and switch on for every trip. It was fast in our test, and it is the cheapest global unlimited plan we have compared. There are no single-country plans, and nothing shorter than 3 days.

Key facts

• 165+ countries
• iPhone app 4.5
• Android app 4.7
• Auto Top-Up
• Hotspot
• 5.5 GB/day at full speed

Trustpilot

4.5/512,788 reviews

Payments

Credit or debit cardApple PayGoogle PayPayPal

Pros and cons

Pros 4 Cons 4

Cheapest global unlimited plan

Very fast: 785 Mbps on 5G

Worked for 91% of travelers

Quick checkout, many ways to pay

No country or short plans

Pushes auto top-up hard

Clunky WhatsApp support

“Unlimited” has a hidden daily limit

Maya Mobile eSIM in our hands

Go to Maya Mobile website View full review

Maya Mobile sells one global unlimited plan and nothing for Japan alone, which makes it the choice for a multi-country trip with heavy use and a poor fit for a short Japan-only stay. It worked well for 84 of 93 travelers who reported from Japan (90%), strong evidence. The successes describe Tokyo, Kyoto and Osaka, Hiroshima and 5G in the cities. The nine misses describe slow data in Shibuya and Shinjuku at peak hours, no signal on the Izu Peninsula, intermittent data in Osaka, Nara and Hakone, a service that vanished for two hours in Kyoto (May 2025), and a traveler who got a signal while taxiing to the gate in July 2026 but no data for over an hour afterwards.

Maya's page does not name a Japanese network (checked September 2026). Our comparison tool lists its global unlimited plan for 3, 7, 14 or 30 days, with a Global plus Cruise version; there is no fixed-data plan and nothing shorter than 3 days. In our test it was the fairest unlimited plan: full 5G speed, slowed only after heavy daily use and reset each day, with the APN set by hand, as our Maya Mobile review shows. It is the cheapest global unlimited plan in our comparison, and the drawback is the help desk, where a bot ignored our message before a human with template replies took over. Maya Mobile suits a week or more across several countries.

Ubigi eSIM in Japan: most reports, June outage

6.3 /10

Vefru score Good Score details

• Purchase process4/10
• Mobile app3/10
• eSIM installation8/10
• Customer support2/10
• Speed test9/10
• Prices7/10
• Customer feedback8.2/10
• Coverage9/10

Average of eight categories from our own paid test and customer reviews.

Ubigi is the travel eSIM brand of Paris operator Transatel, with one reusable eSIM for 200+ destinations. Data was fast in our test, and its 3 GB, 10 GB and 30-day unlimited plans are cheap. Its weak point is support: a chatbot that ends in an email ticket, with no live agent.

Key facts

• 200+ destinations
• iPhone app 4.6
• Android app 3.7
• Top-ups
• Hotspot
• 568 Mbps on 5G

Trustpilot

4.1/547,238 reviews

Payments

Credit or debit cardApple PayGoogle PayPayPal

Pros and cons

Pros 4 Cons 4

eSIM by email in a minute

Very fast: 568 Mbps on 5G

Cheap 3 GB, 10 GB and 30-day unlimited

Buy more data even with none left

No live support, only email tickets

Confusing website and app

Few plan sizes, no 20 GB

No refund after you scan the QR code

Ubigi eSIM in our hands

Go to Ubigi website View full review

Ubigi has more Japan reports than the other 13 providers combined and is the only one in this article that rides NTT docomo, the network with the widest reach, which makes it the pick for mountains and rural Japan; it is not a top pick because its record is a little behind the Best group's, because an outage in early June 2026 left many reviewers without data for hours to a day, and because its support was the worst we tested. It worked well for 1092 of 1210 travelers who reported from Japan (90%), strong evidence. The successes are where Ubigi shines: the summit of Mount Fuji, Tateyama and the Japanese Alps, the Kumano Kodo trail, Shirakawa-go, Hokkaido, Ishigaki, and reviewers who could top up at zero balance when the data ran out. One wrote on 8 Aug 2026 that a 5 GB plan "worked great and provided me excellent internet connection throughout" Tokyo, Mount Fuji and Kyoto.

The 118 misses have a few patterns. The June 2026 outage is the largest: reviewers in Tokyo and near Nara in the second week of June described data that stopped, a balance that was still there, and no reply from support. Congestion drops in Shibuya, Shinjuku and Akihabara, slow data in Kyoto and Osaka, no service in Karuizawa, weak signal in Tohoku, trouble in Fukuoka's Tenjin and Nakasu, and unreliable data at Tokyo Disney Resort make up most of the rest. Some Pixel owners could not install at all, some phones got 4G only, and reviewers hit the unlimited plan's fair-use rule (30 or 60 GB in reports, then slowed) and the rule that an unused eSIM expires six months after purchase.

Ubigi's page names KDDI and NTT docomo for Japan and marks 3G as unavailable; Ubigi belongs to Transatel, an NTT company. In our comparison tool its Japan plans run 1, 3, 5, 10, 25 and 50 GB plus unlimited for 7, 15 or 30 days, over 3 to 30 days, with Asia and World plans on top. On price Ubigi is cheap in Europe but among the two most expensive providers in Japan. Our Ubigi review found a clunky site, an app that is a wrapped website, and a support ticket unanswered after 24 hours, so Ubigi suits tech-savvy travelers heading off the main corridors who can live without help.

Holafly eSIM in Japan: unlimited, speed capped

7.1 /10

Vefru score Very good Score details

• Purchase process7/10
• Mobile app7/10
• eSIM installation9/10
• Customer support6/10
• Speed test4/10
• Prices5/10
• Customer feedback9.4/10
• Coverage9/10

Average of eight categories from our own paid test and customer reviews.

Holafly is an Irish eSIM provider built around unlimited data, with trip eSIMs for 200+ destinations. Travelers report it working more often than any other provider we track. Its weak points are speed and price: our test ran at about 30 Mbps on 5G, and its unlimited plans cost more than most.

Key facts

• 200+ destinations
• iPhone app 4.8
• Android app 4.7
• No top-ups
• Hotspot 1 GB/day
• 30 to 40 Mbps

Trustpilot

4.7/5113,513 reviews

Payments

Credit or debit cardApple PayGoogle PayPayPal

Pros and cons

Pros 4 Cons 4

Truly unlimited data

Most reliable we track: 92% worked

One-tap install, no QR code

6 months to refund an unused eSIM

Slow: about 30–40 Mbps on 5G

Pricier than other unlimited eSIMs

Saved our card without asking

No top-ups, buy a new eSIM instead

Holafly eSIM in our hands

Go to Holafly website View full review

Holafly is the unlimited plan for people who do not want to think about data, with one condition that we state wherever it is named: in our test its speed was capped from the start, before any data was used, while every other provider ran at full speed or slowed only after a daily allowance. In practice that is enough for maps, messaging, browsing and streaming, and slow for large downloads, uploads, cloud backups and laptop work. It worked well for 118 of 131 travelers who reported from Japan (90%), strong evidence. The successes describe Tokyo, Kyoto, Osaka, Hiroshima, Nara and Okinawa, mountain and rural routes, and a phone that switched between SoftBank and au on its own.

The 13 misses match the cap: slow data and high latency because traffic was routed through the United States or Spain, an eSIM that stopped on day 11 or day 13 of a longer plan, and drops in Osaka. Holafly's page names KDDI and SoftBank as its networks, limits the hotspot to 1 GB a day, and acknowledges a fair-use rule without a number. There are no top-ups: a longer stay means a new eSIM. Our comparison tool lists Japan unlimited plans for 3, 5, 7, 10, 15 and 30 days. Holafly is the most expensive unlimited plan in our comparison. The install is one tap with no QR, and our Holafly review has the speed finding in detail. Holafly suits travelers who want unlimited data and will not need speed.

Global YO eSIM in Japan: cheap, 4G only, weakest record

8.0 /10

Vefru score Excellent Score details

• Purchase process8/10
• Mobile app8/10
• eSIM installation9/10
• Customer support5/10
• Speed test8/10
• Prices10/10
• Customer feedback8/10
• Coverage8/10

Average of eight categories from our own paid test and customer reviews.

Global YO is a US eSIM provider aimed at young travelers, with plans in 195 countries. It is the second cheapest provider in our price data, and buying and installing took minutes. Its weak spot is support: quick to answer, slow to help.

Key facts

• 195 countries
• iPhone app 4.5
• Android app 3.8
• Top-ups
• Hotspot
• Over 150 Mbps

Trustpilot

4.0/51,293 reviews

Payments

Credit or debit cardApple PayGoogle Pay

Pros and cons

Pros 4 Cons 4

Second cheapest we track

Buy and install in minutes

Apple Pay, Google Pay, social login

Hotspot and top-ups on every plan

Support is slow to actually help

App only, no buying on the web

App stops when your data runs out

Unclear refund rules

Global YO eSIM in our hands

Go to Global YO website View full review

Global YO is the second-cheapest provider in our comparison for Japan but has the weakest record here among providers with strong evidence, so it is not a pick. It worked well for 21 of 30 travelers who reported from Japan (70%). The successes describe fast data at Shibuya Crossing and a solid connection in Tokyo, Kyoto and the mountains. The nine misses describe very slow data, a Samsung Galaxy S23 Ultra that never connected at Narita, no data at Expo 2025 in Osaka, an Asia eSIM that was dead on arrival, a plan that stopped at 1.6 GB, and three failed purchases.

Global YO's Japan page names KDDI as its network and says speed is 4G/LTE only; it lists plans from 1 GB to 100 GB for 3 to 60 days and a 3 GB-a-day Day Plan, with an unlimited option that gives 1 GB a day at full speed, and it says the APN "globaldata" may be needed [8]. Our comparison tool matches that range. The eSIM can only be bought in the app, which dies at zero data, and a deleted eSIM cannot be reinstalled; support in our Global YO review took ten minutes for a template reply. Global YO suits a price-driven traveler who installs at home, checks the APN, and does not need 5G.

GoMoWorld eSIM in Japan: Tokyo misses, limited reports

7.8 /10

Vefru score Very good Score details

• Purchase process8/10
• Mobile app8/10
• eSIM installation8/10
• Customer support6/10
• Speed test10/10
• Prices7/10
• Customer feedback7.6/10
• Coverage8/10

Average of eight categories from our own paid test and customer reviews.

GoMoWorld is the travel eSIM brand of Irish operator eir, with plans in 202 countries. Every destination has the same four euro prices, and we saw no throttling at all. The catch is that everything happens in the app, and human support works only in office hours.

Key facts

• 202 countries
• iPhone app 4.8
• Android app 4.6
• Top-ups
• Hotspot
• No throttling

Trustpilot

3.8/51,987 reviews

Payments

Credit or debit cardApple PayGoogle Pay

Pros and cons

Pros 4 Cons 4

Very fast, no throttling

Among the cheapest from 5 GB

Clean, easy app

Start the plan when you land

App only, no QR code

Human support only in office hours

App stops when your data runs out

Weaker in the US, Japan and China

GoMoWorld eSIM in our hands

Go to GoMoWorld website View full review

GoMoWorld had the fastest, unthrottled data in our test, but its Japan evidence is limited and the misses are in Tokyo, so it is not a top pick. It worked well for 12 of 16 travelers who reported from Japan (75%). The successes describe data the moment of landing in Tokyo and a trip from north to south. The four misses describe a plan that was nearly unusable in Tokyo in August 2026 (the reviewer's companion on Ubigi had data), limited coverage on Amami Oshima, a Pixel that would not activate, and an install that never completed; other reviewers wanted a low-data warning and found the app laggy.

GoMoWorld's page does not name a Japanese network (checked September 2026). In our comparison tool its Japan plans are 3, 14, 30 and 45 GB for 7 or 30 days, with no unlimited plan. The eSIM exists only in the app, one account per device, and you must press Start or nothing happens, which our GoMoWorld review found to be the usual cause of "not working". Human support works office hours only. On price it sits below the market average in Japan. GoMoWorld suits heavy users on a budget who set it up before a weekday flight.

Yesim eSIM in Japan: three misses, slow support

6.6 /10

Vefru score Good Score details

• Purchase process6/10
• Mobile app7/10
• eSIM installation8/10
• Customer support2/10
• Speed test8/10
• Prices5/10
• Customer feedback8.6/10
• Coverage8/10

Average of eight categories from our own paid test and customer reviews.

Yesim is a Swiss eSIM provider built around unlimited plans sold by the day, with one eSIM for 200+ destinations. Data was fast in our test. But its support was among the slowest we have tested, and its fixed-data country plans cost more than most rivals.

Key facts

• 200+ destinations
• iPhone app 4.6
• Android app 4.7
• Top-ups
• Hotspot
• Possible slowdown

Trustpilot

4.3/52,963 reviews

Payments

Credit or debit cardApple PayGoogle PayPayPal

Pros and cons

Pros 4 Cons 4

Fast data in our test

Unlimited plans by the day

Pay with PayPal, Klarna or crypto

Website in 44 languages

Among the slowest support we've tested

Pricey fixed-data country plans

No top-up once your data runs out

Signs you up for marketing emails

Yesim eSIM in our hands

Go to Yesim website View full review

Yesim is not a top pick for Japan: its evidence is limited, it is among the two most expensive providers here, and its help desk was among the slowest we tested. It worked well for 9 of 12 travelers who reported from Japan (75%). Our reviews file holds no Yesim texts for Japan, so we cannot say what the three misses were or where they happened.

Yesim's page does not name a Japanese network (checked September 2026); it describes automatic switching between partner networks, with a fair-use rule set by each partner and no threshold published. In our comparison tool its Japan plans run from 1 GB to 30 GB for 1 to 30 days plus an unlimited Day Pass, with Asia and Global bundles that also cover Japan. In our Yesim review the plan started at purchase rather than on first connection, replies took 15 to 60 minutes, and the app nagged with upsells, so buy close to the trip and use the "activate later" option. Yesim suits experienced users who want flexible day-by-day unlimited data and will not need help.

Providers travelers report from Japan that we have not tested

Simify, an Australian reseller, also appears in the Japan reviews we read, with positive reports and one complaint about a throttled unlimited plan, but we have not tested it and it has no counted reports in our analysis, so it is not ranked here.

Best eSIM Plans for Japan

Price per GB in Japan by eSIM Provider

How much does each provider charge per GB in Japan? The chart below compares plans of 1 to 10 GB that last 6 to 14 days, the usual range for a one- or two-week trip. Provider websites show only their own plans, so this side-by-side view is one you would otherwise have to work out yourself. A shorter bar means a lower price per GB.

The tables below list the current plans in each size, with live prices. For a week of maps, trains, messaging and photos, 5 GB is the size most travelers pick; two weeks with video calls or a phone used as the only map push that to 10 GB, and anyone who streams or hotspots a laptop should look at 20 GB or unlimited. Our data calculator gives a number for your own habits, and this guide explains what each size covers. Keep the unlimited rules from the provider sections in mind: most plans give 3 to 5 GB a day at full speed and slow after that, Holafly was capped from the start in our test, and ByteSIM's Ultra Unlimited publishes no cap.

If you combine Japan with South Korea, the two-country comparison for Japan and South Korea shows only the plans that cover both. Our guides to the best eSIM for South Korea, Thailand and Vietnam cover the other usual stops.

Best eSIM for Tokyo, Osaka, Kyoto and Rural Japan

Ubigi is the place-level pick almost everywhere in Japan, because it is the only provider with strong evidence in any single place: 254 reports from Tokyo alone, more than every other provider's Tokyo reports combined. Its misses are the congestion drops in Shibuya and Shinjuku and the early-June 2026 outage, not dead zones. Saily, the overall pick, has only 2 reports from Tokyo and 1 each from Osaka, Kyoto and Narita, all of them working, so the country pick applies where no provider has 3 or more reports. Counts below are "worked / reported" per provider, in the same order as the matrix; places with 1 or 2 reports in total (Hakuba, Takayama, Shirakawa-go, Ishigaki, Nikko, Kamikochi and some 90 others) are too few to table and take the country pick.

Best eSIM for Tokyo

Ubigi is the pick for Tokyo because it worked for 228 of 254 travelers who reported from the city, strong evidence that no other provider comes close to, and because its misses are explained: peak-hour congestion in Shibuya (1 of 5 reports worked there), Shinjuku and Akihabara, unreliable data at Tokyo Disney Resort (5 of 9), and the outage in the second week of June 2026 that stopped data across the city for hours. Outside those crowds and that week, Ubigi's Tokyo reports describe docomo-grade signal in the metro and on the Skytree and Monorail. If you go on a weekend to Shibuya or to the Disney parks, a second eSIM on a different network is the safer setup, and we explain how to switch in our guide to eSIMs with several networks.

The runners-up have smaller samples and their own catches. Holafly worked for 14 of 15 in Tokyo, but its speed was capped from the start in our test, and its one miss was slow data routed abroad. GigSky worked for 10 of 11 on 4G only; its miss was one-bar signal in Shinjuku while a docomo eSIM held full bars. Nomad worked for 11 of 19 in Tokyo, the weakest ratio of any provider with a real sample here, with reviewers in June and July 2026 describing data a third of the time in the centre. At the airports, Ubigi worked for 16 of 19 at Narita and 4 of 4 at Haneda; the Narita misses were slow first connections, the same problem Roamless, Jetpac and Global YO each had once there, so install at home and switch the line on before you leave the gate.

Best eSIM for Osaka

Ubigi is the pick for Osaka with 83 of 95 reports working, the only strong evidence in the city; its misses were slow data in the centre, a slow start at Kansai International Airport (3 of 5 there), and the June 2026 outage. Holafly worked for 6 of 9, with drops in Osaka named in two of its misses, and Nomad for only 2 of 5, with no signal on the highways around the city. Airalo (4 of 4), GigSky (3 of 3) and Maya Mobile (3 of 4) all have limited evidence; Maya's miss was intermittent data, and a Saily reviewer in June 2026 found speeds inconsistent even with full signal. Global YO's one Osaka report was no data at Expo 2025.

Best eSIM for Kyoto

Ubigi is the pick for Kyoto with 73 of 88 reports working; the 15 misses are slow data in the busiest spots and the June 2026 outage, and reviewers in Uji (2 of 3) and on day trips to Nara (10 of 12) saw the same pattern. Holafly worked for 5 of 5 and Airalo for 4 of 4, limited evidence but clean, with the usual Holafly caveat that its speed is capped. Nomad worked for 3 of 4, Maya Mobile for 3 of 3 (one Maya reviewer lost service for two hours in the city in May 2025 but still counted it as working overall), and Global YO for 2 of 3. Ubigi's reports continue west to Hiroshima (15 of 17) and Kanazawa (4 of 5), so one Ubigi eSIM covers the whole Kansai and Chugoku loop.

Best eSIM for Mount Fuji, Hokkaido and rural Japan

Ubigi is the pick outside the cities because it is the only provider here on NTT docomo, and the reports back it: 14 of 15 at Mount Fuji including summit climbs, 8 of 8 in Hokkaido, 10 of 11 in Hakone, 4 of 4 on the Kumano Kodo, 4 of 4 in Fujikawaguchiko, 3 of 3 in Nagano and Tohoku, 4 of 5 on Shikoku and 6 of 7 in Okinawa; the misses were Karuizawa, weak signal in parts of Tohoku and one drop on Shikoku. Nomad, Jetpac and GigSky each worked for 2 of 2 in Hokkaido and Nomad worked across Tohoku, Ishikawa, Gifu, Shikoku and Kyushu, so KDDI and SoftBank reach the main rural routes too; their misses were drops across Shikoku (Jetpac), slow data in Takayama and Gero (Jetpac) and unstable countryside data (Nomad). No traveler reported from the Japanese Alps huts in numbers, but KDDI says it has put Starlink-backed Wi-Fi in 100 mountain huts, and the three operators' own coverage maps are the best check for a specific trailhead [4] [5] [6].

Local SIM Cards and Operator eSIMs in Japan

A local SIM in Japan beats a travel eSIM only if your phone has no eSIM, you want docomo's radio for a mountain trip and will not use Ubigi, or you want to buy in person after landing; for everyone else a travel eSIM is cheaper per GB by a wide margin and needs no paperwork. As of September 2026 we found no Japanese operator selling a tourist prepaid SIM under its own brand. Tourist SIMs come from resellers on docomo's network: IIJmio's Japan Travel SIM, b-mobile and Sakura Mobile, sold at electronics stores (Yodobashi, Bic Camera, Kojima, Sofmap), the Tourist Information Center at Tokyo Station, some hostels and the airports. A data-only tourist SIM needs no residence card; a voice SIM with a Japanese number does, which is why a Japanese number is out of reach for a visitor.

Prices are thin and dated. Third-party listings in September 2026 put IIJmio's 1.5 GB, 30-day Japan Travel SIM at ¥1,990 at Yodobashi and ¥1,998 at Bic Camera, tax included, and a UK reseller at £25.00 for 1.5 GB and £35.00 for 3 GB; we could not confirm those figures on the retailers' own pages and they may be stale. Sakura Mobile listed data SIMs from $17.96 for 3 days and 1 GB, with airport pickup, as of September 2026, reported. We could not confirm airport-counter prices from any official source, so we do not print them; the counters at Narita and Haneda (Wi-Ho!, NINJA WiFi) sell prepaid SIMs on more than one network with fair-use rules, and the reviews above show that an airport purchase costs you the time that an eSIM installed at home saves.

Operator eSIMs exist for residents, not visitors: third-party reports say docomo's own eSIM needs a 12- or 24-month contract and a residence card, and we could not confirm that on a docomo page. The reseller eSIMs have a trap reported by third parties that we could not verify: IIJmio's eSIM is described as a rolling contract that must be cancelled, while b-mobile's is a one-off, so read the cancellation terms before buying a local eSIM. Don Quijote stores also stock docomo-based prepaid SIMs, reported. For most trips the comparison is simple: the 10 GB plans in the tables above cost far less per GB than a 1.5 GB retail SIM, and every provider in this article needs no ID at all.

Mobile Networks in Japan

NTT docomo has the widest reach, KDDI (au) the most consistent connection and SoftBank the fastest data, and only one provider in this article, Ubigi, rides docomo; everyone else is on KDDI, SoftBank or both. The regulator's figures at 31 Mar 2026 put docomo at 32.9% of mobile contracts, KDDI's group at 26.2%, SoftBank at 18.7%, Rakuten Mobile at 3.6% and the MVNOs (resellers on the big networks) at 18.5% [1]. 5G contracts (126.32 million) passed LTE (108.85 million) in that count, and only 2.28 million 3G contracts remained, because docomo switched off the last 3G network in Japan on 31 Mar 2026 [1]. 5G covered 98.4% of the population at the end of fiscal 2024 by the regulator's count, with prefectures ranging from 88.4% to 99.9% [2]; trade press citing the regulator put it at 98.6% a year later, with Shimane, Kochi and Iwate still under 95%. The regulator's target for the end of fiscal 2030 is 99% of the population and 99% of roads, and it funds satellite and high-altitude links for remote islands, offshore areas and mountains, which is where the gaps still are [3].

Which operator is best depends on where you stand. According to Opensignal's April 2026 report, docomo won both coverage measures and 5G download speed, au won consistency, reliability and every experience award, SoftBank won raw download speed and time on 5G, and Rakuten won uploads but trails far behind on 5G reach. The same report splits Japan into eight regions and the winners swap: SoftBank was fastest in Hokkaido, Tohoku, Kinki, Chubu, Chugoku, Shikoku and Kyushu, and au only in Kanto, while docomo fell to third on download speed in Tohoku, Chugoku and Kanto. The read-through for a trip: on the Tokyo-Osaka corridor a KDDI or SoftBank eSIM gives equal or better speed and reliability, and the docomo gap bites on mountain roads, islands and the quieter prefectures. Our guide to 4G versus 5G explains why time on 5G matters less than coverage.

Provider by network, as the sources label it. Verified on the provider's own page: eSIM4Travel (KDDI and SoftBank), Holafly (KDDI and SoftBank), Saily (KDDI and SoftBank), Nomad (KDDI au and SoftBank, varying by plan), ByteSIM (KDDI and SoftBank, KDDI alone on Ultra Unlimited), Ubigi (KDDI and NTT docomo), Global YO (KDDI, 4G/LTE only) [8], and Airalo (SoftBank plus one unnamed other, as of September 2026). Reported by a third party only: Jetpac on KDDI. Could not confirm: GigSky, whose own pages name docomo on one and docomo plus SoftBank on another. Not named on the provider's page when we checked in September 2026: Yesim, Roamless, GoMoWorld and Maya Mobile; our comparison tool lists Roamless as KDDI. Rakuten Mobile appears only in a regional Jetpac plan listing. If you want docomo without Ubigi, a reseller SIM from the local SIM section is the route; if you want two networks on one eSIM, Saily, Holafly, Nomad, eSIM4Travel and ByteSIM's dual plan name both KDDI and SoftBank.

Two more things matter for a trip. Since 1 Apr 2026 the operators run "JAPAN Roaming", a disaster roaming scheme that lets a phone use another operator's 4G network when its own goes down in a catastrophe [7]; whether a travel eSIM benefits is not stated, so do not count on it. And the docomo, au and SoftBank coverage maps are public and updated often, with docomo's showing planned coverage months ahead, so a quick check of your route is worth more than any national percentage [4] [5] [6].

How to Set Up an eSIM for Japan

Install at home over Wi-Fi, the day before you fly, and switch the line on when the plane lands: that one habit removes the most common failures in the Japan reviews (a slow first connection at Narita, a plan that starts too early, an APN that needs typing). Every provider in this article except Yesim and GoMoWorld starts the plan on first connection in Japan, not on install, so there is nothing to lose by installing early.

1. Check the phone. It must be carrier-unlocked and eSIM-capable, and it must register on 4G or 5G, because Japan has no 3G left. Our list of phones that take an eSIM covers the models; reviewers had the most install trouble on some Pixel phones (Ubigi, GoMoWorld) and the most first-connection trouble on Samsung Galaxy S22 and S23 Ultra phones (Roamless, Global YO).
2. Buy and install at home. Saily, Roamless, GigSky, GoMoWorld and Global YO install inside their apps; eSIM4Travel, Airalo, Maya Mobile, Ubigi, Yesim, ByteSIM, Jetpac, Nomad and Holafly send a QR code by email. Saily waits up to 180 days for first connection, Nomad 60 days, eSIM4Travel 90 days, and an unscanned Ubigi QR code expires 6 months after purchase. Yesim's plan started at purchase in our test, so buy it last, and GoMoWorld needs its Start button pressed. The iPhone guide and the Samsung guide show the screens, and this guide turns a manual activation code into a scannable QR.
3. Set the line up before landing. Label the eSIM, keep your home SIM for calls, and set the eSIM as the data line with data roaming switched on for that line; a travel eSIM is a roaming profile, and roaming off is the most common reason for "no data" in the Holafly, Saily, Nomad and Jetpac reviews. Leave the eSIM line off until you land if the provider says the plan starts on first connection.
4. Type the APN if the provider needs one. Global YO uses "globaldata" [8], Maya Mobile "globaldata" and Ubigi "mobiledata", GigSky "gigsky", and Roamless needed a manual network switch in our test. Everything else set itself up.
5. On landing, switch the line on and wait. Most reviews describe data within a minute; a few waited longer at Narita. If nothing happens, toggle airplane mode, pick the network by hand (KDDI, SoftBank or docomo, whichever your provider names), and on Jetpac switch the physical SIM off. Our troubleshooting guide covers the rest, and the help desks that answered fastest in our tests were Saily's, eSIM4Travel's and GigSky's.

Calls and SMS in Japan

Every Japan plan in our comparison tool is data-only, so calls go over WhatsApp, LINE (the app most Japanese businesses use), FaceTime or a similar app, and a Japanese phone number is not something a visitor can get, because a voice SIM needs a residence card. Japan's calling code is +81. For a number you can be reached on, the options are regional or add-on plans: Airalo's Asialink, Discover and Discover+ plans cover Japan with minutes and texts and give a US number, which the Discover plans in our tool list with voice. Jetpac sells in-app voice packs by the minute, Roamless has in-app calling plus an optional second number, Saily sells a US number as an add-on, and Global YO has outgoing VoIP calls in its app. ByteSIM sells local-number plans in other countries but not for Japan. Receiving a one-time SMS from your bank works on your home SIM if you keep it active for calls and texts while the eSIM carries the data; check your home operator's roaming price for an incoming text, which is often free.

Free eSIM Data for Japan

Several providers in this article give data away in Japan, and the GigSky Visa plans are the biggest of them: a large share of GigSky's 68 Japan reports came from travelers using the free plans that Visa Infinite and Visa Signature cardholders can claim in the app, which cannot be topped up and do not cover cruise ships. GigSky also gives every new account a free 100 MB trial. Roamless lists a free Japan trial plan in our comparison tool and gives new accounts free credit. Nomad gives a free 1 GB trial, GoMoWorld a free one-day trial, Jetpac a free 100 MB Eterna eSIM, and Holafly's Always On keeps a small monthly allowance alive after a plan ends if you keep the eSIM installed. Our round-up of free eSIM plans and trials lists the current conditions.

Summary: the best eSIM for Japan

Based on 2055 traveler reports and our own tests, we recommend Saily for most trips to Japan: it worked well for 36 of 37 travelers who reported from here, its app and help desk were the best we tested, and its one weakness is a price above the market average in Japan. Roamless (23 of 24) is the one-eSIM answer for a trip that adds South Korea or Thailand, as long as you use little data, because it is dear from 10 GB up and needed a manual network switch in our test. GigSky (64 of 68) earns its place through the free plans for Visa cardholders and an app that works at zero data, on 4G only and at the highest price here without that card. ByteSIM (76 of 81) is the unlimited pick with a Japanese IP on KDDI, with a clumsy checkout and support that never answered us. Airalo (92 of 99) is the easy start with calls and texts in its regional plans, with a half-day outage on 24 Jun 2026 as its black mark.

eSIM4Travel rounds out the group as the cheapest provider in our comparison for Japan with the best help desk in our test, on only 2 reports, one of them a miss, and with no app. Outside the group, Ubigi deserves a look from anyone heading for Mount Fuji, Hokkaido or the Kumano Kodo, with 1092 of 1210 reports working on the only docomo-based plan here, and Holafly from anyone who wants unlimited data and accepts the speed cap we measured. Whichever one you pick, the best eSIM for Japan is the one installed at home, with data roaming on for its line, before the wheels touch down.

Compare All eSIM Plans for Japan

Every Japan plan from the 14 providers in this article, in one comparison with live prices.