Internet in Japan: A Traveller's Guide
Updated: October 2026
Short answer: travelling Japan without internet is like entering a maze without a map: you need the train system, an address finder and a translator all day long. The old solution was a rented pocket Wi-Fi device; today the Japan eSIM does the same job with no device, no queue and for less.
Your options
1. Roaming on your home SIM: Japan is among the most expensive roaming zones; depending on your carrier it is a steep day pass or pay-as-you-go rates several times the cost of an eSIM per gigabyte (our roaming vs eSIM guide).
2. Renting a pocket Wi-Fi: The Japan classic: a device you collect at the airport, carry with you and keep charged. The responsibility for losing it, and the obligation to return it, add a small worry to the holiday.
3. eSIM: No device, no queue, nothing to return. Set it up at home; when you land at Narita, Haneda or Kansai, your phone joins the Japanese network.
The coverage reality
- Coverage is excellent in Tokyo, Kyoto, Osaka and along every tourist route; 5G is standard in the cities.
- On the Shinkansen, coverage is good the whole way; short drops in tunnels are normal.
- In mountain towns and on remote temple trails the signal can weaken; download the day's route in the morning while you have reception.
Practical tips
- Finding your way around the Tokyo metro without train navigation is serious work; your map app will be open all day, so choose your data allowance with that in mind.
- Finding restaurants and shops in Japan runs on the internet too; signs are mostly in Japanese only, and camera translation is a lifesaver.
- Free public Wi-Fi is not as common as people think; even in cafés you will have to ask for the password.
Ready? See the Japan eSIM plans; from a week's trip to monthly options.