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eSIM for Japan: how much data to pack

Q: Will one eSIM cover both Tokyo and Hokkaido?

Yes, a Funsim local plan for Japan works nationwide, including Hokkaido and Okinawa.

Q: Does internet work on the shinkansen at high speed?

Yes, coverage is reliable on most shinkansen routes, though brief signal drops in tunnels are normal — even for local carriers.

Q: Should I activate the Japan eSIM before I fly or after I land?

You can install the profile at home ahead of time, then turn on data roaming after you land in Japan, so the plan's validity period doesn't start counting down early.

Japan is one of the most tech-forward countries in the world, with fast, reliable mobile coverage almost everywhere. Here's which eSIM plan to get for Tokyo, Osaka, Kyoto and shinkansen trips between cities.

How much data do you need for a Japan trip

For a week in Tokyo or Osaka with subway navigation, a translation app and social media, 5–8 GB is usually enough. For an active multi-city trip on the shinkansen with constant map use — Tokyo, Kyoto, Osaka, Sapporo, Okinawa — go for 10–15 GB or more.

Coverage in Tokyo, Osaka and Hokkaido

Coverage is fast and reliable almost everywhere in Tokyo, Osaka and Kyoto, including the subway and shinkansen. Hokkaido (Sapporo) and Okinawa also have good coverage in tourist areas, though signal can be weaker in mountainous or sparsely populated regions.

Navigating Japan: what to use instead of familiar map apps

Japan's multi-layered subway systems and address format (without the street names you might expect) mean navigation apps tend to use more data than in other countries. It's worth padding your data plan a bit, especially if you'll be moving around Tokyo or Osaka a lot.

See eSIM plans for Japan