Can I use my own phone in Japan?
Short answer
Yes. A prepaid eSIM is usually far cheaper than roaming — but it gives you data only, not a Japanese number.
The least painful route: eSIM before you fly
If your phone supports eSIM, buying and installing one before departure is the shortest path. It activates when you land, there is no counter to find and no card to swap, and your home SIM stays in place.
Do the installation at home while you still have a working connection. Some providers need you to scan a code and download a profile, which is awkward to do in an arrivals hall on airport Wi-Fi.
Buying on arrival
The main international airports have SIM counters and vending machines in the arrivals area. Vending machines are faster but give you no one to ask when the settings do not take.
Electronics shops in the cities sell tourist SIMs too, which is the fallback if you land somewhere without a counter.
Data-only is the catch
Almost every tourist plan sold in Japan is data-only. You get internet, but no Japanese phone number, and no ability to make an ordinary call.
This matters more than it sounds. A number of good restaurants take reservations only by telephone, some ticketing and delivery services want a domestic number to confirm, and if you get genuinely stuck, calling someone is not an option. Messaging apps cover most of the gap, not all of it.
Free Wi-Fi
Stations, convenience stores, cafés and many trains carry free Wi-Fi. It is widespread but fragmented — most networks want a one-time registration, and each operator runs its own.
It is a reasonable backup and a poor primary plan. Navigating an unfamiliar city on network coverage that stops at the shop door gets tiring quickly.
Good to know
- Some restaurants take bookings only by phone, which a data-only plan cannot do
- Station and convenience store Wi-Fi is common but usually asks you to register once per network
Yes, but decide how before you fly. A local SIM has to be registered against your passport, and a number of services you use daily will not load.
Yes, if the handset is unlocked — and bring your passport, because every SIM here is registered to a named person.
Buy a prepaid SIM on arrival with your passport — it is cheap, the coverage is good, and a local number is what makes the ride-hailing apps work.
Yes, and you may barely need data — free public Wi-Fi runs on subway trains, buses and in most cafés.
There is a genuine national free wifi network — iTaiwan, over 5,000 hotspots, and since 2020 no registration at all. Connect, open a browser, done.