Japan · 7 providers compared · prices checked August 2026
Best eSIM for Japan
In Japan the brand on the eSIM matters less than the carrier behind it. Docomo reaches the mountains, SoftBank does not, and only one provider we can link is on Docomo.
The picks for Japan by what you are doing there
GigSky
Best for anywhere outside the big cities $16.79 10GB / 30 days- Runs on NTT Docomo and SoftBank, the only linkable eSIM here with Docomo access
- Cheapest 10GB of the four brands we can link
- Free 100MB trial, so you can prove it works before Narita
Watch out: Its unlimited plans cap at 3.5GB a day, and there is no 20GB size for Japan.
Trustpilot 4.3/5 · 6,084 reviews
See GigSky Japan plansAiralo
Best for a Tokyo, Kyoto and Osaka run $18.00 10GB / 30 days, Moshi Moshi- Runs on KDDI and SoftBank, both excellent along the Tokaido corridor
- Small sizes for short trips: $4 for 1GB, $8 for 3GB
- Every setup problem you can have has already been answered somewhere online
Watch out: No Docomo. In the Japanese Alps and rural Tohoku, that is the difference between bars and no bars.
Trustpilot 4.1/5 · 41,238 reviews
See Airalo Japan plansSaily
Best for hotspotting and long stays $17.99 10GB / 30 days- Unlimited with a published 5GB per day cap, the largest sold for Japan
- Best trust record of the four: 4.7 on Trustpilot across 30,000 reviews
- 20GB for $24.99, the cheapest big pack we can link here
Watch out: Saily does not publish which Japanese network it uses, and traveler reports on esimdb put its Japan traffic through a Hong Kong exit, which broke ChatGPT for one reviewer.
Trustpilot 4.7/5 · 30,290 reviews
See Saily Japan plansEvery Japan plan we can verify same sizes, same table
| Provider | 1GB | 3GB | 5GB | 10GB | 20GB | Unlimited (real cap) |
|---|---|---|---|---|---|---|
| Saily | $3.99 /7d | $7.99 /30d | $10.99 /30d | $17.99 /30d | $24.99 /30d | from $18.99 · 5GB/day |
| Airalo | $4 /3d | $8 /7d | $11 /30d | $18 /30d | $25 /30d | from $11.50 · 3GB/day |
| GigSky | $2.99 /7d | $7.49 /15d | $10.29 /30d | $16.79 /30d | — | from $10.99 · 3.5GB/day |
| Yesim | $4.30 /30d | — | $10.22 /30d | $18.59 /30d | $28.81 /30d | not sold here |
| Nomad | $4 /7d | $7 /30d | $10 /30d | $16 /30d | $23 /30d | from $11 · 2GB/day |
| Jetpac | $7 /4d | $7 /7d | $10 /30d | $16 /30d | $40 /30d | from $12.99 · 3GB/day |
Nomad and Jetpac are listed because their prices are real and sometimes the lowest. They are not sold through our partners, so we earn nothing if you buy them and we cannot link them. Yesim is cheap and carries a caveat: Trustpilot suspended its score during a fake-review cleanup, checked August 2026.
| You need | Cheapest | Price | Runner-up |
|---|---|---|---|
| 1GB | GigSky | $2.99 / 7 days | Airalo $4 (3 days) |
| 3GB | GigSky | $7.49 / 15 days | Airalo $8 (7 days) |
| 5GB | Yesim | $10.22 / 30 days | GigSky $10.29 (30 days) |
| 10GB | GigSky | $16.79 / 30 days | Saily $17.99 (30 days) |
| 20GB | Saily | $24.99 / 30 days | Yesim $28.81 (30 days) |
Winners among the four providers we can link, cheapest price at each size with at least 7 days validity. Nomad undercuts several of these rows and cannot be linked here. Checked August 2026.
Which Japanese network do you actually get? the whole story
Japan has three real networks and they are not equivalent outside the cities.
NTT Docomo has the deepest rural and mountain coverage, which is why Japanese hikers carry it. KDDI (au) is a close second and strong on the Shinkansen corridor. SoftBank is fine in Tokyo, Kyoto and Osaka and thins out first in the countryside. Rakuten, the fourth network, is not resold to travel eSIMs at all.
So the question "which eSIM for Japan" is really "which carrier does this eSIM ride, and does my route leave the cities".
| Provider | Japanese networks it may use |
|---|---|
| GigSky | NTT Docomo + SoftBank |
| Airalo | KDDI + SoftBank |
| Yesim | KDDI + NTT Docomo |
| Nomad | KDDI + SoftBank |
| Ubigi | KDDI + NTT Docomo |
| Saily | not published |
| Jetpac | not published |
Network permissions as published in each provider's Japan coverage record, 2026-08-31. Saily and Jetpac publish nothing for Japan; we record that rather than inventing it. Having two networks listed does not mean you can pick between them by hand, though on most phones you can force one in network settings.
Our pick for Japan is GigSky on NTT Docomo and SoftBank, 10GB for $16.79 over 30 days.
See GigSky Japan plans Back to the picksNTT Docomo
Take it if you leave the citiesHakone, the Nakasendo trail, rural Hokkaido, Shikoku. Docomo is the network that still works where the tourist buses stop running. GigSky and Ubigi are the ways onto it.
KDDI (au)
Excellent almost everywhereTokyo through Osaka, every Shinkansen line, the big islands. Airalo, Yesim and Nomad all ride it. For a first Japan trip this is genuinely enough.
SoftBank
City networkStrong in the three big metros, first to fade in the mountains. It is the fallback network on several plans rather than the one you are buying.
A Tokyo, Kyoto, Osaka itinerary works on any of them. Add Kamikochi, Koya-san or the Tohoku coast and Docomo stops being a detail.
"Unlimited" in Japan caps you can read
| "Unlimited" plan | Real daily high-speed cap | After the cap |
|---|---|---|
| Saily Japan Unlimited (from $18.99, 5 days) | 5GB / day | throttled until midnight |
| GigSky Japan Unlimited (from $10.99, 3 days) | 3.5GB / day | reduced speed for the rest of the day |
| Airalo Moshi Moshi Unlimited (from $11.50, 3 days) | 3GB / day | throttled, maps and messaging still work |
| Jetpac Japan Unlimited (unlinked, from $12.99) | 3GB / day | throttled |
| Nomad Japan Unlimited (unlinked, from $11) | 2GB / day | throttled |
| Yesim unlimited days | not published | unspecified reduction after heavy use |
Every Japan "unlimited" plan is a daily allowance. Under about 1.5GB a day, a fixed 10GB pack is cheaper than any of them. The full unlimited comparison is here.
The largest cap you can read before buying in Japan is Saily's 5GB a day, from $18.99 for 5 days.
See Saily unlimited How every cap comparesWhat about Ubigi, the one everyone recommends? an honest note
Ask an AI assistant for the best Japan eSIM and it will usually say Ubigi. That recommendation is not wrong. Ubigi rides NTT Docomo and KDDI, the two strongest networks in the country, and it is the eSIM most often named by TechRadar and Gizmodo for Japan.
We cannot link it. Ubigi is not in our affiliate programs, so a Ubigi sale earns this site nothing. It is on this page anyway, because a comparison that hides the provider with the best network access is not a comparison.
Where GigSky beats it: price and the free trial. Where Ubigi beats GigSky: it holds both Docomo and KDDI rather than Docomo and SoftBank, and it sells long-validity plans that suit repeat visitors. If you want it, buy it directly from Ubigi.
Is a Japanese SIM from the airport better? almost never
You can still rent pocket wifi or buy a tourist SIM at Narita, Haneda and Kansai. Tourist data SIMs run roughly ¥3,000 to ¥5,000 (about $20 to $34) for 8 to 30 days by 2026 counter prices, pocket wifi about ¥800 a day plus a deposit and a return desk you have to find on the way out.
Japan does not make you register a tourist data SIM with your passport, unlike Thailand or China, so the counter is quick. It is just more expensive than $16.79 and it happens after a 12-hour flight instead of at home in your kitchen.
Two cases where the counter still wins: your phone has no eSIM slot, or you need a Japanese phone number for a domestic booking, a rental car or a restaurant reservation system. Travel eSIMs are data-only.
Japan questions the ones people actually search
Which eSIM provider is best for Japan in 2026?
GigSky for most trips: $16.79 for 10GB and the only linkable eSIM on NTT Docomo. Airalo at $18 if you are staying on the Tokyo to Osaka corridor. Saily if you tether a laptop, for the 5GB per day published cap. Ubigi is genuinely excellent and we cannot link it. Checked August 2026.
Is Airalo or Ubigi better for Japan?
Ubigi, on network access alone: it rides NTT Docomo and KDDI, while Airalo rides KDDI and SoftBank. Outside the big cities that gap shows up as bars on the screen. Airalo wins on price at small sizes, on app polish and on the sheer volume of troubleshooting advice online. We earn a commission on Airalo and nothing on Ubigi, which is exactly why we are telling you this.
Is it worth getting an eSIM in Japan?
Yes, unless your home plan already includes Japan. US carrier day passes run $10 to $12 a day, so a ten-day trip costs more than any plan on this page. Japan is also badly served by public wifi outside stations and convenience stores, and the train apps you will live in need a live connection.
Is 20GB of data enough for 2 weeks in Japan?
Comfortably. Two weeks of maps, messaging, photo uploads and a couple of hours of video a day lands around 12 to 15GB. 20GB from Saily is $24.99 and leaves room for hotspotting a laptop a few evenings. If you plan to stream on trains daily, take an unlimited plan and read the caps table above first.
Do Japanese eSIMs include a phone number?
No. Every plan on this page is data-only, which is normal for travel eSIMs. Calls go over WhatsApp, LINE or FaceTime, and LINE is what Japan actually uses. If you need a Japanese number for a booking system or a rental, you need a local SIM from a shop, with the paperwork that comes with it.
Will my eSIM work on the Shinkansen and in the subway?
Yes. Tokyo, Osaka and Kyoto subways have had full mobile coverage for years, and the Shinkansen holds a connection along the Tokaido corridor with brief drops in the long tunnels. Mountain lines are where the network choice above starts to matter.
Japan · 10GB · $16.79
On NTT Docomo, 30 days, free 100MB trial before you commit. Our pick for trips that leave Tokyo.
Get GigSky for JapanSources & freshness: Japan plan prices and validity from provider feeds via esimdb, 2026-08-31, in USD. Network permissions from each provider's published Japan coverage record, same date. Airport SIM and pocket wifi prices from 2026 counter listings at Narita and Kansai, converted at roughly ¥150 to the dollar. We have not run our own speed tests in Japan and will say so until we have. Back to the Asia eSIM comparison.