Japan Rural Coverage Test: Hakone → Mt. Fuji → Mt. Koya
Still got signal outside cities? Real test of 5 popular rural Japan spots on Docomo / SoftBank.
Reviewed by the GB eSIM team · Last updated 2026-05-21
Tested 5 spots
Hakone Yumoto: Docomo 4G 25 Mbps, SoftBank 4G 18 Mbps; Mt. Fuji 5th Stn: Docomo 4G 12 Mbps, SoftBank 4G 8 Mbps; Karuizawa: Docomo 5G 65 Mbps; Mt. Koya: Docomo 4G 6-10 Mbps (tunnel drops); Shirakawa-go: Docomo 4G 15 Mbps. Docomo strongest rural; 5G mainly urban.
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