4G & 5G Coverage in Japan: What to Expect
eSIM from 1,00 USD · 100 MB. Networks: KDDI/au (5G), NTT docomo (4G), NTT docomo (5G), Rakuten Mobile (5G), SoftBank (5G).
Real-world coverage in Japan
4G coverage is generally good in cities and major roads. 5G is expanding — available in some capital cities and tech hubs. In practice, most travel eSIMs use 4G/LTE.
Known problem areas
- Deep mountain areas (Nikko and Hakone lake districts)
- Remote islands (Yakushima, Iriomote in Okinawa)
- Some train tunnels on scenic rural lines
- Basement floors of dense Tokyo electronics districts
Coverage by city
- Tokyo: Excellent coverage; Metro LTE on most lines; dense buildings can blip indoors.
- Osaka: Strong 4G/5G; Dotonbori and Namba districts well-covered.
- Kyoto: Good coverage; bamboo forest in Arashiyama can temporarily drop.
- Hiroshima: Solid coverage; Peace Memorial area and Miyajima island both served.
- Sapporo: Good in the city; ski resorts at Niseko have reasonable coverage.
- Fukuoka: Well-covered; Hakata Station corridor excellent.
Tip: if you're visiting rural areas or national parks, download offline maps and don't count on permanent signal.