The Narita/HND/KIX counter is a battery you return. Maps do not need a brick if *#06# shows an EID.

Copied 2026-08-29 (expire when checkout changes):

• Ubigi 10GB/7 days US$14, NTT Docomo. 7-day unlimited SKU URL was 404 that day.
• Airalo Japan 7-day 5GB US$10, 10GB US$17, unlimited 7-day US$27 (3GB/24h then 1 Mbps).
• Holafly Japan 7-day US$27.50; hotspot 1GB/day.

Install on home Wi-Fi the night before. Airport Wi-Fi is a login portal.

eSIM ≠ Suica. Suica is FeliCa. Most US/EU Android still cannot add Welcome Suica Mobile.

Dated notes (Airalo affiliate; others official): https://before-you-land.tiiny.site/japan/pocket-wifi/