Suica tap at the ticket gate works with no mobile data. Maps, translation, and topping up the card do not.
Install an eSIM at home. Turn the Japan plan on after you land.
Prices copied from official pages on 29 Aug 2026 (confirm checkout):
- Airalo Japan unlimited: 3GB high-speed per 24 hours, then 1 Mbps
- Ubigi 10GB / 7 days: US$14 on KDDI and NTT Docomo
- Holafly Japan 7-day unlimited: US$27.50; hotspot 1GB/day. They do not publish a Japan GB/day FUP number.
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