eSIM for Japan: always online in the land of the future
An eSIM for Japan keeps you connected from the neon streets of Tokyo to the temples of Kyoto and the Shinkansen that takes you between them. Japan is outside the European Union, so roaming is expensive there, and today an eSIM replaces the cumbersome pocket Wi-Fi of the past. With the language barrier, a reliable connection is also almost indispensable. This guide explains everything with tables, tips and a FAQ.
Do I need an eSIM in Japan?
Yes, almost certainly. Japan is not an EU country, so your home data is charged at the expensive outside-Europe rate. Travellers used to rent a pocket Wi-Fi, but that is an extra device to carry and charge. An eSIM does the same thing directly in your phone, without an extra device, and your home number stays active.
Outside the EU: on arrival, turn off the mobile data of your home SIM card and use only the eSIM, to avoid expensive roaming.
More on this in eSIM or roaming.
How much data do you need in Japan?
| Type of traveller | Usage | Recommended data |
|---|---|---|
| Light (weekend) | Maps, WhatsApp, occasional social media | 1 to 3 GB |
| Average (week) | Social media, sharing photos, navigation | 5 GB |
| Heavy (1 to 2 weeks) | Lots of navigation, videos, translation | 10 GB |
| Long trip or sharing | Tethering, working, family | 20 GB or more |
In Japan you use a lot of translation and navigation in the dense metro network. So plan generously, from 10 GB for one to two weeks. Our guide how much data do you need when travelling helps you choose.
eSIM or roaming: which is cheaper in Japan?
| roaming with your home carrier (outside the EU) | eSIM for Japan | |
|---|---|---|
| Cost | High rate per MB, adds up quickly | Fixed price in advance, from 1.99 euro |
| Risk of surprises | Large | None |
| Data volume | Limited and expensive | You choose yourself |
| Your home number | Stays active | Stays active (dual SIM) |
For Japan the eSIM wins easily, and it replaces the pocket Wi-Fi at the same time.
What is the coverage like in Japan?
| Area | Coverage |
|---|---|
| Large cities (Tokyo, Osaka, Kyoto) | Excellent, 4G and 5G |
| Train lines such as the Shinkansen | Very good |
| Tourist regions | Good |
| Remote mountains and countryside | Usually still good |
Japan has one of the best mobile networks in the world, so you are well covered almost everywhere.
Installing an eSIM for Japan
Install at home over Wi-Fi before you leave. After your purchase you receive a QR code and activation link by email.
On iPhone
- Open Settings, go to Mobile Data and choose Add eSIM.
- Scan the QR code, or tap the activation link in the email.
- On arrival, turn on data roaming for the eSIM line.
Full instructions: installing an eSIM on iPhone.
On Android
Open the mobile network settings, choose to add a SIM card and scan the QR code. Details per brand are in installing an eSIM on Android.
Installing is not the same as activating. Validity usually only starts on your first connection in Japan, so you can safely install in advance. Also check that your device is compatible via phones with eSIM.
Keeping your home number
Thanks to dual SIM, your home number stays reachable for calls and bank codes, while the eSIM handles your data. Set the eSIM as your default data line and turn off the mobile data of your home SIM. More on this in dual SIM with eSIM.
Tips to save data in Japan
- Download offline maps and your route before you leave.
- Use an offline translation app.
- Set cloud backups and updates to Wi-Fi only.
- Turn off autoplay video in apps.
- Do large downloads over your hotel Wi-Fi.
Frequently asked questions about an eSIM in Japan
### Does an eSIM replace the pocket Wi-Fi?
Yes. An eSIM does the same job directly in your phone, without renting, carrying and charging an extra device.
When does the validity period start?
With most eSIMs only on your first connection to the local network, not at installation.
What if I run out of data?
With many eSIMs you can easily top up without installing a new one.
Conclusion
Japan is outside the EU, so an eSIM saves you the most here and replaces the pocket Wi-Fi. Count on at least 10 GB for one to two weeks. Install at home over Wi-Fi, turn off your home data, activate on arrival. At esimzu you pay easily by card, receive your eSIM straight away by email and benefit from a lowest-price guarantee.