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eSIM, pocket Wi-Fi or SIM card: getting data in Japan
Which option suits solo travellers, couples and families, how to install an eSIM before you fly, and what to do if it does not connect.
You will use data constantly in Japan: train routes, maps, translation and restaurant bookings. Free public Wi-Fi exists but is patchy. Sort out data before you land.
The three options
| eSIM | Pocket Wi-Fi | Physical SIM | |
|---|---|---|---|
| Best for | Solo travellers and couples with new phones | Families and groups sharing one plan | Older unlocked phones without eSIM |
| Set up | Install at home, switch on at landing | Collect at the airport or hotel | Buy at the airport or electronics stores |
| Downsides | Phone must be unlocked and eSIM-compatible | Must be charged and carried; return it at the end | Easy to lose your home SIM in the swap |
| Phone number | Usually data only | No | Usually data only |
How to set up an eSIM
- Check your phone is carrier-unlocked and supports eSIM. Your phone settings or your carrier will tell you.
- Buy a Japan plan sized to your trip. Heavy map and social media users get through about 1–2 GB a day.
- Install it at home on Wi-Fi by scanning the QR code. Do not delete it after installing.
- On landing, switch the eSIM line on, set it as the data line, and turn on data roaming for that line only.
- Keep your home SIM on for calls and texts if you need bank security codes, but turn off its data roaming to avoid charges.
If it will not connectCheck data roaming is on for the eSIM line. Restart the phone. Check the access point name (APN) matches the setup instructions. Screenshot those instructions before you leave home.
Do I need a Japanese phone number?
Rarely. Some restaurant bookings and lotteries ask for one, but most apps that visitors use work with your home number or email. Some providers sell plans with a number if you need one.
Battery
Navigation drains batteries fast. Carry a power bank. Note that airlines limit power bank sizes and many now ban using them in flight. Keep them in your carry-on, never in checked luggage.
