Internet in Japan: eSIM, Carriers & Travel Guide
eSIM from 1,00 USD · 100 MB. Networks: KDDI/au (5G), NTT docomo (4G), NTT docomo (5G), Rakuten Mobile (5G), SoftBank (5G).
Current eSIM Plans (examples)
Carriers & Coverage in Japan
NTT Docomo
Best for: Widest coverage including rural Japan
- Largest network; reliable on shinkansen and mountain routes
- Best choice for travelling outside major cities
SoftBank
Best for: Urban speeds and 5G
- Strong in Tokyo, Osaka and Kyoto
- Good on popular tourist routes; weaker in deep countryside
au (KDDI)
Best for: Balance of speed and coverage
- Good nationwide reach and competitive in cities
- Strong in western Japan (Kansai, Kyushu)
Known Weak Signal 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.
Useful Apps in Japan
- Ride-hailing: GO (taxi), S.RIDE, DiDi Japan
- Maps: Google Maps, Apple Maps, Yahoo! Japan Maps
- Messaging: LINE, WhatsApp
Everything About Internet in Japan
Cities
Internet in Tokyo
Internet in Osaka
Internet in Kyoto
Internet in Hiroshima
Internet in Sapporo
Internet in Fukuoka
Internet in Nara
Internet in Okinawa
Getting There
Carriers
Coverage
Prices & Plans
Data Prices
Roaming vs SIM vs eSIM
7 / 15 / 30-Day Plans
Unlimited Data & Fair Use
How Much Data Do I Need?
Practical
Uber, Maps & Taxis
How to Activate an eSIM
No Signal / APN Troubleshooting
SIM Scams & Where to Buy Safely
WhatsApp, 2FA & Banking