Best eSIM for Japan in 2026: Travel Plans Compared

I'm a digital nomad. I started traveling and working online in 2017, and I've now been to 50+ countries. When I buy an eSIM for a trip, I usually take 10 or 20 GB.

For a Japan trip, the choice starts there too: will 10 or 20 GB be enough, or is unlimited data worth it?

My picks

• Best for phone and laptop: Ubigi eSIM for Japan, 10 GB for 30 days at $16.50, and Ubigi says it also works on Windows laptops with eSIM.
• Best for most trips: eSIMGlobe eSIM for Japan, 10 GB for 30 days at $9.90, with 5G and hotspot.
• Best unlimited data: Saily eSIM for Japan, unlimited for 7 days at $26.99, with a hotspot you can share with a friend.
• Best for Japan and South Korea: Jetpac's Japan eSIM, whose Asia Pacific plan sells 10 GB for 30 days at $19.99, with South Korea on the same plan.
• Best pay as you go: Roamless eSIM for Japan, where 1 GB costs $2.45 from a balance that never expires.

You can put their plans side by side with all five on one page.

Prices checked on October 10, 2026.

In this article

• Best eSIM for Japan: 10 GB and 20 GB plans compared
• Best unlimited data eSIM for Japan: Saily for 5 GB a day
• Japan eSIM reviews: my five picks
  • Ubigi eSIM for Japan: best for phone and laptop
  • eSIMGlobe eSIM for Japan: best for most trips
  • Saily eSIM for Japan: best unlimited data
  • Jetpac eSIM for Japan: best for Japan and South Korea
  • Roamless eSIM for Japan: best pay as you go
• What eSIM has the best coverage in Japan?
• eSIM or a Japan SIM card for tourists?
• Visiting Korea too? Best eSIM for Japan and Korea on one trip
• My verdict: what is the best eSIM for Japan?

Best eSIM for Japan: 10 GB and 20 GB plans compared

For 10 GB or 20 GB over 30 days, my pick for the best eSIM for Japan is eSIMGlobe: its 20 GB plan costs less than Roamless's 10 GB.

For a week or two, choose a 30-day plan: at Jetpac, 10 GB for 7 days costs $13.00 on sale and 10 GB for 30 days $16.00.

Every current plan is on our Japan eSIM plans page.

Best unlimited data eSIM for Japan: Saily for 5 GB a day

Saily is the best Japan eSIM for unlimited data, because each day of the plan gets 5 GB at full speed.

Most unlimited plans for Japan work by the day: a set amount at full speed, then a slower speed. Jetpac and Roamless reset that amount every 24 hours, while Airalo, Saily and Nomad say "per day" without a time.

Ubigi's 8-day plan also gives up to 5 GB a day at full speed, for $25.00. The amount resets every 24 hours from the time you activate the plan.

Proof: Ubigi confirms its 8-day unlimited Japan eSIM gives up to 5 GB of full-speed data daily and resets it every 24 hours

The 15- and 30-day plans from Ubigi give 30 GB or 60 GB at full speed for the whole plan, and then 2 Mbps.

eSIMGlobe charges less for a week than Saily. Its plan page names no amount of full-speed data.

Spend a week between Tokyo and Kyoto with maps open all day and a video call home every night. Saily's 7 days then give you up to 35 GB at full speed.

Japan eSIM reviews: my five picks

Ubigi eSIM for Japan: best for phone and laptop

Pros

• Runs on NTT Docomo and KDDI
• 5G on both networks
• Works on Windows laptops with eSIM
• Starts on arrival in Japan

Cons

• No 20 GB plan, 25 GB at $32.00
• Shortest unlimited plan is 8 days
• Data only, no phone number

Ubigi's page says the eSIM works on laptops with eSIM and Windows 10 or 11, not only on phones, so I recommend it when you work from a laptop in Japan. The eSIM goes into the laptop itself, and the laptop gets online without a hotspot from your phone. Ubigi runs on NTT Docomo and KDDI, both with 5G, and a month of unlimited data costs $65.00. Skip it if you want 20 GB. Above 10 GB, the next fixed plan is 25 GB for 30 days.

Proof: Ubigi confirms its Japan eSIM runs on KDDI and NTT Docomo

For most trips, take 10 GB for 30 days at $16.50. The 7-day plan with the same 10 GB costs $14.00, and that's only a week.

Late in a month in Japan, the 30-day unlimited plan's 60 GB at full speed may be gone. Your phone then runs at 2 Mbps, which Ubigi says still covers messaging such as WhatsApp, emails, maps and light browsing for the rest of the plan.

Hotspot use is allowed too. The plan begins when you arrive in Japan, not when you install it. You can buy more data in the app even without Wi-Fi.

Ubigi plans for Japan

• 1 GB for 3 days: $3.50
• 10 GB for 7 days: $14.00
• 10 GB for 30 days: $16.50
• 25 GB for 30 days: $32.00
• Unlimited for 8 days: $25.00
• Unlimited for 15 days: $39.00
• Unlimited for 30 days: $65.00

See Ubigi's plans for Japan

Compare all Ubigi eSIM Japan plans at today's prices here on eSIM Spotter. Read my full Ubigi eSIM review for prices in other countries, what buyers say and my verdict.

eSIMGlobe eSIM for Japan: best for most trips

Pros

• 20 GB for 30 days at $14.00
• 5G on KDDI and SoftBank
• Hotspot allowed on your plan's data
• 180 days to start the plan

Cons

• Unlimited plans state no full-speed amount
• No plan for Japan and South Korea
• Data only, no phone number

My top pick for most trips is eSIMGlobe. The plan to buy is 10 GB for 30 days at $9.90, $5.05 less than the same plan at Roamless. If you want fixed data at a low price, it's the best eSIM to use in Japan. I don't recommend it for unlimited data or for a trip that goes on to South Korea. For those, choose Saily or Jetpac.

Choose the 20 GB plan if you think 10 GB won't be enough: it costs $14.00, and 1 GB then costs $0.70. For a long stay, eSIMGlobe sells 50 GB for 180 days at $42.90.

On KDDI and SoftBank, eSIMGlobe lists 5G. Its specs say "Hotspot: Yes", and your hotspot takes data from the same plan. Unlimited plans start at $5.50 for 3 days.

Your 30 days start on arrival in Japan, and you get 180 days from purchase to start them. Buy the eSIM the evening you book a trip two months away, and it stays unused until you land.

eSIMGlobe plans for Japan

• 1 GB for 7 days: $2.90
• 3 GB for 30 days: $4.90
• 5 GB for 30 days: $6.90
• 10 GB for 30 days: $9.90
• 20 GB for 30 days: $14.00
• 50 GB for 30 days: $26.90
• 50 GB for 180 days: $42.90

See eSIMGlobe's plans for Japan

Compare all eSIMGlobe eSIM Japan plans at today's prices here on eSIM Spotter. Read my full eSIMGlobe eSIM review for prices in other countries, what buyers say and my verdict.

Saily eSIM for Japan: best unlimited data

Pros

• 5 GB a day at full speed
• Limitless hotspot sharing
• Auto top-up in the app

Cons

• 30-day unlimited costs more than at other providers
• No fixed plan above 20 GB

I recommend Saily for unlimited data because every plan length, from 1 to 30 days, gets 5 GB a day at full speed. Roamless costs $3.47 less for a week but gives 3 GB a day, and Ubigi matches Saily's daily amount only on its 8-day plan. Skip Saily for one big fixed plan. Its fixed plans stop at 20 GB.

Fifteen days cost $48.99, and 30 days $71.99. After the daily amount, speed drops to up to 1 Mbps. A full month costs more than at Ubigi ($65.00), Jetpac ($65.99) or Airalo.

Saily connects to local networks in Japan, including KDDI and SoftBank, and says high-speed 5G is available across major cities, including Tokyo, Kyoto and Osaka.

Two of you in one hotel room can share one plan. Saily offers "Limitless hotspot sharing with friends and family." Once you split up for the day, the second phone needs its own eSIM.

The plan starts by itself when you arrive, with the Saily eSIM turned on and roaming enabled, and you have 180 days to activate it. You can add more data in the app or pick an auto top-up.

Saily plans for Japan

• 1 GB for 7 days: $3.99
• 5 GB for 30 days: $10.99
• 10 GB for 30 days: $17.99
• 20 GB for 30 days: $24.99
• Unlimited for 7 days: $26.99
• Unlimited for 15 days: $48.99
• Unlimited for 30 days: $71.99

See Saily's plans for Japan

Compare all Saily eSIM Japan plans at today's prices here on eSIM Spotter. Read my full Saily eSIM review for prices in other countries, what buyers say and my verdict.

Jetpac eSIM for Japan: best for Japan and South Korea

Pros

• Asia Pacific: 17 countries, Japan and South Korea
• KDDI and Rakuten, both with 5G
• Unlimited hotspot, no data cap
• Free WhatsApp chat and maps after data

Cons

• Data only, no SMS
• 20 GB costs more than 30 GB

If your trip goes on from Japan to South Korea, I recommend Jetpac, because its Asia Pacific plan covers both and 15 more countries, with 10 GB for 30 days at $19.99. With Japan as your only stop, Jetpac's own Japan plan sells 10 GB for 30 days at $16.00 on an October sale, and eSIMGlobe's 10 GB costs less.

At $40.00, Jetpac's 20 GB plan costs more than its 30 GB plan at $29.99 on sale.

Jetpac runs on KDDI and Rakuten in Japan, both with 4G and 5G, and connects automatically to the strongest available network.

Proof: Jetpac confirms its Japan eSIM runs on KDDI and Rakuten with 4G and 5G

Hotspot use on Jetpac has no data cap. On packs of 3 GB and more, WhatsApp chat, Uber, Grab and Google Maps stay free after your data runs out. With the plan used up on your last evening in Osaka, the map back to your hotel still loads.

Jetpac's data plan starts once you activate the eSIM or connect to the local network. Until then, it stays in your account for 3 months from purchase. Calls go through voice packs in Jetpac's app.

Jetpac plans for Japan

• 3 GB for 1 day: $5.00
• 5 GB for 30 days: $10.00
• 10 GB for 30 days: $16.00 (on sale)
• 20 GB for 30 days: $40.00
• 30 GB for 30 days: $29.99 (on sale)
• Unlimited for 7 days: $25.99 (on sale)
• Asia Pacific (17 countries), 10 GB for 30 days: $19.99

See Jetpac's plans for Japan

Compare all Jetpac eSIM Japan plans at today's prices here on eSIM Spotter.

Roamless eSIM for Japan: best pay as you go

Pros

• Pay as you go, balance never expires
• First 500 MB free for new users
• Same balance works in South Korea
• Unlimited hotspot

Cons

• 5G named on SoftBank only
• On pay as you go, 1 GB costs more than on its 10 GB plan

On a short or light trip, Roamless charges only for the data you use. That's where I recommend it: 1 GB costs $2.45. If you already know you need 10 GB, choose Roamless's own 10 GB for 30 days at $14.95 instead.

New users get their first 500 MB free. What you don't use stays on the balance for your next trip, and in South Korea the same balance works, in Roamless's words: "your Balance keeps you online there too".

Roamless uses KDDI and SoftBank and picks the strongest available signal automatically, with 5G on SoftBank. Hotspot is unlimited.

For unlimited data, Roamless sells any length from 1 to 90 days with 3 GB a day at full speed, and a week costs $23.52. Plans start when the eSIM connects to a Japanese carrier. At checkout, use our code CopiedESIMSPOTTER.

Roamless plans for Japan

• Pay as you go, 1 GB: $2.45
• 5 GB for 30 days: $9.95
• 10 GB for 30 days: $14.95
• 20 GB for 30 days: $22.95
• 50 GB for 30 days: $45.95
• Unlimited for 7 days: $23.52

See Roamless's plans for Japan

Compare all Roamless eSIM Japan plans at today's prices here on eSIM Spotter.

What eSIM has the best coverage in Japan?

For the best coverage in Japan, choose Roamless or Jetpac, because their pages say they switch between their two networks by themselves. Ubigi, eSIMGlobe, Saily, Jetpac and Roamless all use KDDI, and the second network is NTT Docomo on Ubigi, Rakuten on Jetpac and SoftBank on the other three.

Japan's Ministry of Internal Affairs and Communications (MIC) lists four mobile networks: NTT Docomo, KDDI, SoftBank and Rakuten. MIC also puts 5G at 98.6% of the population at the end of March 2026, with the four networks' areas counted together.

If you want a 5G eSIM for Japan, check the plan as well as the brand. Nomad's 10 GB plan for Japan says "Speed 4G".

Proof: Nomad confirms its 10 GB Japan plan runs on 4G

Nomad's unlimited plans give "2GB/day at 4G/5G".

Proof: Nomad confirms its 7-day unlimited Japan plan gives 2 GB a day at 4G/5G

5G on a plan page doesn't mean 5G everywhere: eSIMGlobe says it does not guarantee 5G on every train journey, underground station, rural area or indoor space.

Only Airalo says in words that it covers Okinawa and Hokkaido: "Covers all of Japan, including Okinawa and Hokkaido."

Proof: Airalo confirms its Japan eSIM covers all of Japan, including Okinawa and Hokkaido

No other provider leaves them out.

Away from the cities, the signal gets weaker. Roamless says data stays strong underground on the Tokyo Metro and on the bullet train, but advises saving your maps offline before a hike around Mount Fuji. Holafly warns about mountains, forests and islands far from the main populated areas. If your route runs from Tokyo up into rural Hokkaido or the Japanese Alps, Saily itself says coverage there is patchier.

eSIM or a Japan SIM card for tourists?

Most visitors are better off with an eSIM. You buy it online before the flight and set it up at home with our guide to install an eSIM on iPhone or on Android, and your home SIM stays in the phone for calls and texts from home.

One Japan SIM card for tourists is IIJmio's Japan Travel SIM, data only on NTT Docomo's network. You buy it in Japan: Ministop convenience stores sell it in eSIM form, some Lawson stores sell the physical SIM, and you register it with an email address.

Today a tourist data SIM needs no passport, but a SIM with a Japanese phone number does. A law passed in May 2026 will add ID checks for data SIMs too, says MIC's July 2026 briefing.

For the full comparison, read eSIM vs SIM card for travel.

Visiting Korea too? Best eSIM for Japan and Korea on one trip

My pick for Japan and Korea on one trip is Jetpac's Asia Pacific plan: 10 GB for 30 days costs $19.99, $1.01 less than Nomad's plan for 22 countries. From Osaka to Seoul, eSIMGlobe, my pick for most trips, has no plan with both countries: "a stop in South Korea or another country requires a plan that lists that destination".

My guide to the best eSIM for South Korea covers the Korean side, and our Asia eSIM plans page shows the regional plans. For a longer route, pick every country on our homepage and see which plans cover all of them.

My verdict: what is the best eSIM for Japan?

In the big cities, every travel eSIM I recommend for Japan works. For the Japanese Alps, rural Hokkaido or the far islands, take Roamless or Jetpac. Ubigi has two networks too, but its pages don't say it switches by itself.

For most trips, eSIMGlobe is the best eSIM card for Japan, with 5G and hotspot.

Saily is my pick for unlimited data, with the same fast daily data on a trip of any length. Go with Ubigi when you work from a laptop. Jetpac's Asia Pacific plan is my pick when the trip goes on to South Korea. Roamless suits a short or light trip.