Japan is one of the world's most technologically advanced countries, yet as a tourist you can run into surprising challenges when it comes to internet. The good news: in 2026 an eSIM is the simplest and best solution for mobile internet in Japan.
Important to know: only data SIMs are available to tourists in Japan
This is the key point: in Japan, tourists cannot buy a traditional voice-enabled SIM card. Under Japanese regulation, a local phone number and voice service can only be obtained with a long-term residence permit.
This means that whether you use a local SIM or an eSIM, you only get a data connection. For voice calls you need to use WhatsApp, Viber, FaceTime or another VoIP app over the data connection, which works perfectly.
Japanese mobile networks
There are three major mobile operators in Japan:
- NTT DoCoMo: the largest and most reliable network, with excellent rural coverage
- SoftBank: strong urban coverage, good tourist plans
- KDDI (au): a reliable third operator
Japan's mobile network is among the world's best: 4G/LTE coverage reaches 99% of the country, and 5G is widely available in the big cities.
Pocket Wi-Fi vs. eSIM
For a long time in Japan, pocket Wi-Fi (a portable Wi-Fi router) was tourists' main internet solution. But in 2026 an eSIM is clearly the better choice.
| Aspect | eSIM | Pocket Wi-Fi |
|---|---|---|
| Weight | None (it's in your phone) | 100–200 g separate device |
| Charging | Your phone's battery | Needs separate daily charging |
| Price | More attractive | More expensive (daily fee) |
| Pickup/return | None (digital) | Arrange at airport/post |
| Multiple devices | Yes, with hotspot | 5–10 devices by default |
| Activation | 2–3 minutes, from home | At airport, with queuing |
Surprising: free Wi-Fi is rare
Although Japan is a technology superpower, free public Wi-Fi is surprisingly rare and awkward:
- Most Wi-Fi hotspots require registration (email, SMS confirmation)
- Cafés (Starbucks) and convenience stores (7-Eleven, FamilyMart) have Wi-Fi, but it's slow and time-limited
- The shinkansen (bullet train) has Wi-Fi, but it's often overloaded
- Metro stations offer the 'Japan Wi-Fi auto-connect' app, but it's unstable
That's exactly why an eSIM is almost essential: you can't rely on public Wi-Fi in Japan.
Coverage: excellent everywhere
| Area | Coverage | Speed |
|---|---|---|
| Tokyo, Osaka, Kyoto | Excellent | 5G: 500+ Mbps |
| Smaller cities | Excellent | 4G: 50–150 Mbps |
| Rural areas | Good | 4G: 20–80 Mbps |
| Mountain trails | Medium | 4G/3G |
| Shinkansen (train) | Good | 4G, continuous |
| Tokyo metro | Excellent | 4G/5G, at stations and in tunnels |
Cultural and practical tips
- Google Translate (camera mode): Few people speak English in Japan, and most signs are in Japanese (kanji). Google Translate's camera feature translates signs in real time, this needs an internet connection
- Google Maps: Japan's address system differs from Europe's, instead of street names there are block numbers. Without Google Maps it's almost impossible to navigate
- Suica/Pasmo app: You can now use transit cards with Apple Pay and Google Pay too, this also needs internet to set up
- Restaurant finder: The Tabelog app (Japan's TripAdvisor) helps you find the best places
Summary
When travelling to Japan, an eSIM is the best solution in 2026: no pocket Wi-Fi rental and return, no airport queues, and instant internet on the excellent Japanese 4G/5G network. Your home number stays active on the physical SIM, and you can call without any problem through VoIP apps, all prepaid in your own currency, from the eSIM Surfer app.