Japan eSIM

Japan's mobile networks reach almost everywhere people live, and a Japan trip runs on your phone: train routes, a Suica in your wallet and LINE for messages. Our Japan data packs run on NTT docomo, and Unlimited uses all four networks.

What a week of data costs in Japan

Prices for 7 days of data, checked on 2 November 2026. Daily passes charge each day you use the phone abroad, per phone.

For a family of four on Verizon, that's $336 for one week. Singtel's pass is cheaper but only promises 1 GB a day at high speed, and a local SIM means a shop visit and taking your home SIM out of a single-SIM phone.

Landing at Narita (NRT), Haneda (HND) or Kansai (KIX)

Most long-haul flights to Tokyo land at Narita or Haneda; Kansai serves Osaka and Kyoto. Switch the kimsim line on as the plane taxis, with Data Roaming on for that line only, so your train times load before you reach immigration.

In the terminal, in order: immigration, bags, then customs. Japan's major airports have free Wi-Fi in the terminals, and rental kiosks for pocket Wi-Fi and data SIMs. Haneda now has prepaid SIM vending machines in all three terminals. With your eSIM already working, you can walk past all of them.

Narita into Tokyo: the Narita Express runs to Tokyo, Shinagawa, Shibuya, Shinjuku and Yokohama. The Keisei Skyliner reaches Nippori in as little as 36 minutes, then Ueno.

Haneda into Tokyo: the Keikyu Line and the Tokyo Monorail both start inside the airport. Shinagawa is about 15 minutes away and Tokyo Station about 30.

Kansai into Osaka and Kyoto: the JR Haruka limited express stops at Tennoji, Osaka and Shin-Osaka, and reaches Kyoto in about 1 hour 20 minutes.

Leaving: tax-free shopping became a refund scheme on 1 November 2026. You pay tax in the shop, and customs checks your goods at the airport before you leave. Narita, Haneda, Kansai, Chubu, New Chitose, Fukuoka and Naha have designated areas for it. Leave extra time, and keep your data on until you've finished.

Networks and coverage

Japan has four mobile network operators: NTT docomo, KDDI (sold as au), SoftBank and Rakuten Mobile, the newest, which launched its own 4G network in April 2020. Your phone shows the Japanese operator's name, not kimsim.

5G reached 98.4% of the population by the end of March 2025, with every prefecture between 88.4% and 99.9%. That counts where people live, not hiking trails, so expect 4G or nothing on remote mountain routes and small islands.

Shinkansen lines have had coverage along their whole length, tunnels included, since December 2020, built for docomo, KDDI and SoftBank. The ministry still warns of weak spots. If one network is weak where you're staying and your plan lists several, you can pick another network by hand.

The networks your plan uses are listed above.

Tokyo, Kyoto and Osaka, Hokkaido and Okinawa

• Tokyo: this is where a Tokyo eSIM earns its keep. Getting across the city means changing between JR, metro and private railway lines, and you'll check the next platform on your phone at every change. The busiest stations can slow down at rush hour.
• Kyoto and Osaka: a short train ride apart, so one plan covers both. Uber lists taxi service in Kyoto and Osaka.
• Hokkaido: Sapporo and New Chitose airport are on Uber's Japan list, and so is Hakuba in the Alps. On ski slopes and back-country routes, around Niseko too, download maps and resort apps on the hotel Wi-Fi and expect gaps between lifts.
• Okinawa: Naha is covered by Uber taxis. Expect weaker signal on ferries and the smaller outer islands.
• Hiking: the Kumano Kodo and the Japanese Alps cross long forested ridges with patchy signal. Download offline maps, and don't count on the phone for an emergency call (see below).

Getting around

Most trips are by train. Google Maps and Apple Maps show routes, platforms and transfers across JR, metro and private lines. An IC card pays for trains, buses and convenience-store shopping:

• iPhone: JR East's Welcome Suica Mobile app is made for visitors. It works with Apple Pay only, and the card lasts 180 days.
• Plastic cards: sales of standard Suica and PASMO cards were suspended in June 2023 because of a chip shortage, and restarted on 1 March 2025.
• Android: if Google Wallet won't add a Suica on your phone, buy a card at the station.

In the Kansai area the local card is ICOCA, and it works for the fare on the Haruka.

Apps worth having

• LINE is Japan's everyday messaging app, with more than 100 million monthly users in Japan since December 2025. Guesthouses, tour guides and new friends may ask for your LINE ID. Sign in at home, because a new account may send a text code to your usual number.
• Taxis: Uber in Japan books licensed taxis. GO, a Japanese taxi app, has an English version, covers all 47 prefectures and takes international cards. Both verify your phone number, so set them up at home where the text arrives.
• Maps and translation: download Japanese for offline use in your camera translator, for menus and ticket machines.
• Safety tips is a free alerts app made under the Japan Tourism Agency's supervision. It pushes earthquake, tsunami and heat warnings in 15 languages, and it needs data to receive them.
• Payments: in 2024, 42.8% of consumer spending in Japan was cashless. So carry yen for small restaurants, shrines and rural buses.

SIM and phone rules

A Japanese line with a phone number is a contract with an ID check. Japan's Mobile Phone Improper Use Prevention Act makes carriers check who you are when you sign up, and in 2026 it was amended to cover data SIMs too. So expect to show your passport for a local SIM, even a data-only one.

Tourist SIMs are data only. The ones sold at airports and electronics stores give you data with no number, so you can't receive texts. Your phone must be unlocked for any local SIM, and the same goes for an eSIM. Check your phone works with eSIM before you buy.

An eSIM installed at home skips the counter, the paperwork and the SIM swap, and your home number stays on the phone for bank codes.

Common mistakes

• Installing in the arrivals hall. You need a connection to install, and terminal Wi-Fi is a slow place to start. Install on Wi-Fi before you fly.
• Leaving Data Roaming on for your home line. That's where daily charges like the ones in the table start. Why roaming goes on for the kimsim line only
• Starting the plan on a stop-over. If you connect through Seoul, Hong Kong or another hub, keep the kimsim line off until you land in Japan. If your plan started early
• Adding South Korea on a Japan plan. A Japan plan works in Japan only. For both, look at the regional plans above or a separate South Korea eSIM. How regional plans work
• Expecting to dial 110 or 119 on a data-only eSIM. Those are Japan's police and fire/ambulance numbers. Use your home line or any local phone. JNTO's 24-hour visitor hotline, in English, Chinese and Korean, is +81-50-3816-2787.

More on Japan

• eSIM for Japan: what to know before you fly
• How much data do I need for a week abroad?
• Unlimited eSIM data: what "unlimited" really means

How we put this page together

We checked operators' and carriers' own pages, Japanese government releases, airport and rail operators' sites and the other sources noted above on 1–2 November 2026, and we'll keep them up to date. We haven't measured speeds or coverage in Japan ourselves, so coverage notes are general guidance, not a map. kimsim sells the eSIMs on this page.