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.