Best eSIM for Japan

Do you need an eSIM in Japan?

six honest cases

The picks

in short

Yesim is the fourth brand we can link and it owns the top of the table at 30GB, which nobody else sells for Japan: $39.60 for 30 days. Trustpilot suspended its score during a fake-review cleanup and has since switched it back on, 4.3 across 2,996 reviews as of 2026. We say the history rather than pretending it did not happen. The full Yesim review explains when the saving is worth it.

Compare every Japan eSIM

side by side

Prices in USD, checked 2026, before any promo code. Ubigi, Nomad, Sim Local and Mobal are listed unlinked because we earn nothing from any of them. Mobal sells in yen only; ¥3,850 is about $26 at ¥150. Ubigi in particular is the brand ChatGPT and Perplexity both name first for Japan, it holds Docomo and KDDI, and leaving it out would make this table a lie. ¹ Hover the marker for the Yesim caveat.

The cheapest Japan eSIM at each size

one row, one winner

Read the validity column, not just the price. Airalo's 5GB is 56 cents cheaper than Yesim's and expires twenty-three days sooner, which is the whole difference between a long weekend and a month. Airalo wins 20GB at 15 days; if your trip is longer, Saily's 20GB at $24.99 over 30 days is the one you want for 99 cents more. Nomad undercuts several of these rows and cannot be linked here. Checked 2026.

Who each provider is actually for

plain answers

Which plan fits your trip?

days × GB a day, cheapest first

Which network does your eSIM use in Japan?

the Docomo problem

This is the part that decides whether your trip works, and almost nobody writes it down. In Japan the brand printed on the eSIM matters far less than the carrier behind it, because the carriers are not equivalent once you leave the cities.

Rakuten Mobile, the fourth national network, appears in Airalo's network list for Japan, though Airalo's plan text names only SoftBank and KDDI; no other brand here lists it. The practical rule: a Tokyo, Kyoto and Osaka itinerary works on any of these, and the eSIM choice comes down to price. Add Kamikochi, Koya-san, the Tohoku coast or inland Hokkaido and Docomo stops being a detail. The full network page maps each carrier against real places.

Is unlimited really unlimited in Japan?

every 7-day plan, cap by cap

Only one 7-day "unlimited" plan in Japan is sold without a daily cap, and it is a local KDDI plan we earn nothing from. Every other one is a daily allowance with a different name. Under about 1.5GB a day, a fixed 10GB pack is cheaper than any of them for a week. Figures from each brand's own plan pages, checked 2026, not from a test; GigSky publishes its 3.5GB cap but not the speed after it. The full unlimited breakdown works out the price per real gigabyte.

Local eSIM or travel eSIM?

what each provider says about where your data comes from

A local eSIM is sold by or for a Japanese carrier. A travel eSIM is a foreign company's line roaming onto a Japanese network. Where your traffic exits, and so which country your IP address shows, is something most brands do not print. This table holds only what each provider states.

Two practical differences. A local plan on KDDI is where you find a Japan plan with no daily cap. And local Japanese data SIMs are what the 2027 ID rule is written for. If you need a Japanese IP for a specific service, no brand here promises one in writing, so test it on day one. Checked 2026.

How much data a Japan trip actually uses

real numbers

Assumes hotel wifi most nights, offline maps downloaded before you leave, and no video streaming over cellular. Japan pushes the top row up rather than down, because Google Translate's camera mode is genuinely how you read a menu here and it is not a light feature, and because the train apps re-query constantly when a line is disrupted. Convenience store and station wifi exists and is close to useless: it wants an email registration for every session. The full calculator breaks it down per app.

Where a travel eSIM works and where the network choice starts to matter

place by place

Nobody can promise you a bar of signal at a specific ryokan. What we can do is name the carrier each place leans on, so you know when any eSIM on this page is enough and when the Docomo question becomes the only question.

Compiled from the three carriers' published coverage maps, Japanese mobile coverage reporting for 2026, and traveler reports through 2026. We have not walked every one of these routes with a signal meter and we are not going to pretend otherwise. How we test.

Do you need a passport for a Japan eSIM?

not for a travel eSIM; Japanese data SIMs need ID from 1 April 2027

A travel eSIM bought from a foreign provider is outside the rule. Asked in parliament, the government said that visitors on a foreign carrier's contract who use Japanese networks through an international roaming agreement normally have no direct contract with a Japanese operator, so the law does not regulate them; the ministry will watch for misuse and act if needed (House of Representatives Internal Affairs Committee, 12 May 2026, minutes in Japanese). The final list of covered SIMs is set by the implementing ordinances, which we re-check. Today Yesim's Japan page states "ID verification: Not required", and none of the other travel eSIM brands here lists an ID step for Japan.

The counters are still there. SoftBank runs tourist SIM desks in the arrivals halls at Narita, Haneda and Kansai, and Mobal will post a SIM to your hotel before you arrive. A counter data SIM costs roughly ¥3,000 to ¥5,000, about $20 to $34, for 8 to 30 days. That is more than GigSky's 10GB at $16.79, and it happens after a twelve-hour flight rather than at home in your kitchen.

Two cases still send you to the counter anyway: a phone with no eSIM slot, and needing a Japanese phone number. The local SIM guide covers the shop route and the 2027 rule in detail, and the phone number page compares the three ways to get a domestic line.

Setting it up takes about four minutes

before you fly

1. Check the phone. Dial *#06#. If an EID appears, the phone takes an eSIM. If it is carrier-locked, sort that out first, because no eSIM works on a locked handset.
2. Buy and install on home wifi. Install the profile before you fly. Do not plan to scan a QR code at the gate: the plan does not start counting until it connects in Japan, so waiting saves you nothing and costs you a working phone at immigration.
3. Land, then switch. Turn the eSIM line on for data, leave your home line on for calls with data roaming off. That one toggle is what stops the $12-a-day charge.
4. If it will not connect, set network selection to manual and pick the carrier your plan actually rides: NTT Docomo for GigSky, KDDI for Airalo. In the mountains it may be Docomo or nothing, and that is the coverage gap rather than a broken eSIM. Full setup and fixes.