Japan eSIM

Staying connected in Japan

The quickest way to get online in Japan is to install a travel eSIM at home and switch it on when you land at Haneda (HND), Narita (NRT) or Kansai (KIX). AirOva sells three kinds of Japan plan: fixed GB plans, unlimited data with no data cap, and plans with calls. GB plans run on NTT docomo, Rakuten Mobile, KDDI (au) and SoftBank, unlimited plans on KDDI (au), and plans with calls on KDDI (au), with 5G where available — each plan card lists its network.

Which Japan plan to choose

GB plans suit most trips. For a week, about 8–10 GB covers a typical tourist on Google Maps, translation and photos; light users manage on 3–5 GB, and heavy users who video-call or upload daily should plan on 15 GB or more. Unlimited plans are priced by the number of days, for travellers who would rather not count gigabytes on a long trip or a working week. Plans with calls add call minutes and SMS to mobile data. Not sure? See how much data you need.

Coverage: cities, Shinkansen and the countryside

Japan's networks are excellent across Tokyo, Osaka, Kyoto and Yokohama, along the Shinkansen corridors and in the main tourist regions, including Hiroshima, Nara, Kanazawa, Fukuoka and the main areas of Hokkaido. The Tokyo and Osaka subways have signal on platforms and in most tunnels. Expect short drops in long rural rail tunnels, deep in the mountains — parts of the Kumano Kodo, the Japanese Alps, remote onsen valleys — and on small outlying islands, so download offline maps before a hike.

Arriving at Haneda, Narita or Kansai

After landing, turn off airplane mode, switch the eSIM line on, choose it for mobile data and enable Data Roaming for that line; the plan is prepaid, so roaming adds no charge. Keep roaming off on your home SIM. Google Maps then shows the right train, platform and fare into the city. Validity starts on the first connection in Japan, so installing a few days early costs nothing — see how to install an eSIM.

Apps worth setting up before you go

Google Maps for rail routes, Google Translate's camera mode for menus and ticket machines, LINE for messaging hotels and ryokan, and a transit IC card such as Suica or PASMO in Apple Wallet or on supported Android phones. Free public Wi-Fi is less common than many expect outside hotels and big stations. Compared with renting pocket Wi-Fi, an eSIM means no device to carry or return — our eSIM vs pocket Wi-Fi comparison explains when each wins. The Japan eSIM guide covers the first hour after landing and the common mistakes; spending most of the trip in the capital? See the Tokyo eSIM page.

One more Japan tip: data use runs higher than on most trips, because you lean on maps and translation almost constantly. If you would rather not count gigabytes, pick an unlimited plan; otherwise size a GB plan up rather than down — running out between two subway exits is the one thing you don't want. Keep your home SIM in the phone for bank codes, and you'll step off at Haneda, Narita or Kansai already navigating.