eSIM for Japan: mobile data for Tokyo, Kyoto, Osaka and beyond
Staying online in Japan with a travel eSIM instead of a pocket Wi-Fi — coverage, how much data a trip takes, using trains and maps, and setting it up before you fly.
In short
- A travel eSIM for Japan uses the main Japanese networks, with fast 4G and 5G in the cities and wide coverage on the rail lines.
- Compared with a rented pocket Wi-Fi there is no device to pick up, charge, carry or return.
- Japan relies on apps for trains, maps and translation — data is useful every hour of the day.
- For a one-week trip, 5–10 GB covers maps, translation, photos and social media for most travellers.
- Going on to South Korea or China? A combined regional package covers them with one eSIM.
Contents
Japan is a country you navigate with your phone: train connections, station exits, restaurant menus to translate, a map in every street. Free Wi-Fi exists, but it is patchy and often needs a sign-up. A travel eSIM keeps you online the whole day, from the airport train onwards.
Coverage and speed
A travel eSIM for Japan uses the main Japanese mobile networks. Tokyo, Osaka, Kyoto, Hiroshima and Sapporo have fast 4G and wide 5G coverage; the shinkansen lines, the subway and most tourist areas are covered too. In the mountains and on small islands the signal can be weaker.
The networks each package uses are listed on the Japan page — some packages connect to more than one network, which helps where one is weaker.
eSIM or pocket Wi-Fi?
| Pocket Wi-Fi | Travel eSIM | |
|---|---|---|
| Pick-up and return | At the airport or by post | Nothing to pick up |
| Battery | One more device to charge | Your phone only |
| Sharing with others | Several devices at once | One phone; hotspot if needed |
| If you get separated | The person with the router has it | Everyone has their own |
A pocket Wi-Fi can still be handy for a family sharing one connection. For one or two travellers, an eSIM is simpler.
How much data do you need?
| Trip | Typical use | Package |
|---|---|---|
| 3–5 days in Tokyo | Maps, train apps, translation, messages | 3 GB |
| A week, several cities | Plus photos, social media | 5–10 GB |
| Two weeks or more | Video, video calls, sharing a lot | 10–20 GB |
| Working from Japan | Laptop hotspot, video meetings | 20 GB or more |
Japan with South Korea or China
Many trips combine Japan with Seoul or with China. Instead of two eSIMs, a regional package — Japan and South Korea, or China, Japan and South Korea — covers them with one. Look under regions on the packages page.
Setting it up
- Check that your phone supports eSIM and is unlocked.
- Buy a package on the Japan page; the QR code comes to your email and account.
- Install it at home over Wi-Fi — the install guide shows each step.
- When you land, turn on data roaming for the eSIM line and choose it for mobile data. Keep data roaming off on your own line.
Questions and answers
Do I get a Japanese phone number?
No, a travel eSIM is data only. Restaurants and hotels that ask for a number accept your own number from home.
Can I pay with my phone and use transit cards?
Yes — those work through your phone's wallet, not the SIM, so the eSIM does not change them. It just keeps you online while you use them.
When do the package's days start?
When the eSIM first connects to a network in Japan, not when you buy or install it.
See the packages for Japan — the price is shown upfront, with nothing added later.
Ready for your trip?
An eSIM for 200 countries: set up in minutes, with no roaming bill.