Japan has excellent mobile coverage in cities and along the rail network. Free Wi-Fi exists in stations, some trains and many cafés, but it often needs a sign-up each time. Mobile data is simply easier.
How much data for a week in Japan?
Navigation is the big one: you will open maps for trains, transfers and restaurants all day. Add translation apps and photos, and a regular traveller uses about 500 to 800 MB a day.
PlanDataPrice
Japan 7 days1 GB$1.58
Japan 15 days3 GB$3.40
Japan 30 days5 GB$5.40
Japan 30 days10 GB$8.23
Asia, 20 countriesfrom$1.35
Prices are from our current catalogue. For a week of regular use, 5 GB is a comfortable pick. Going on to Korea, Thailand or elsewhere? An Asia plan covers 20 countries on one eSIM.
Tips for Japan
1Install before you flyDo it at home on Wi-Fi. Switch on when you land at Narita, Haneda or Kansai.
2Download offline mapsSave Tokyo and Kyoto in your maps app so a tunnel never leaves you lost.
3Keep a translation app readyCamera translation is a lifesaver for menus and signs, and uses little data.
Going to Japan?See every Japan plan and day pass.See Japan plans
Prices checked on 10 October 2026 and can change. The plan page always shows the current price.