Japan is one of the most technologically advanced destinations in the world, yet historically it has been complicated for travelers to get connected. eSIM has completely simplified this problem: no more renting portable WiFi at the airport. You arrive and already have data.
Japan Coverage and Carriers
| Local Carrier | Coverage | Technology | eSIM Compatible |
|---|---|---|---|
| NTT Docomo | ✅ National | 4G/5G | ✅ |
| SoftBank | ✅ National | 4G/5G | ✅ |
| au (KDDI) | ✅ National | 4G/5G | ✅ |
| IIJmio (MVNO) | ✅ Good | 4G | ✅ |
Data Speed in Japan
Recommended eSIM Plan for Japan
| Trip Duration | Recommended GB | Estimated Cost | For Whom |
|---|---|---|---|
| 5 days (quick trip) | 10 GB | €12–18 | Backpacker / long weekend |
| 7 days (classic week) | 15 GB | €16–22 | Standard tourist |
| 14 days (two weeks) | 25 GB | €22–35 | Extensive traveler |
| 1 month (nomad or Erasmus) | 50 GB monthly | €40–55 | Long stay |
Our recommendation: Japan 15 GB plan for 7 days at €16–22. Activate from home before you leave.
How to Activate the eSIM in Japan
- Purchase the plan on purasim.com before leaving Spain
- Scan the QR received by email (at home, with WiFi)
- Upon landing, activate the data plan in Settings → Mobile Data
- The eSIM automatically connects to the best available carrier
Comparison of Connectivity Options
| Option | Cost 7 days | Speed | Management |
|---|---|---|---|
| Spanish carrier roaming | €50–120 | Normal | No management |
| Local SIM of the country | €8–20 | Very good | Requires in-store paperwork |
| PuraSIM eSIM | €10–20 | Very good | 100% digital, from Spain |
| Hotel WiFi + hotspots | €0 data | Variable | External dependence |
Conclusion
For trips to Japan, the PuraSIM eSIM is the most convenient option: it is purchased and installed from Spain, and upon landing in Tokyo you already have data without waiting. The cost is similar to a local SIM but without the time wasted looking for phone stores at your destination.
Frequently Asked Questions
Do I need a VPN in Japan?
No. Japan does not block any internet service. You can access Google, YouTube, social media, and everything without restrictions.
Is there coverage on Mount Fuji?
In the Fuji-san area, there is coverage up to the fifth access station. The summit may have intermittent signal.
Does eSIM work on the Shinkansen?
Yes, although in some high-speed sections the signal may drop momentarily. For working on the train, it is useful but not perfectly constant.
How many GB do I need for 7 days in Japan?
10–15 GB is more than enough for normal use: Maps, Instagram, WhatsApp, reservations. If you plan a lot of streaming, go up to 20 GB.
Does eSIM work in Osaka and Kyoto the same as in Tokyo?
Yes. The three main cities have excellent Docomo and SoftBank coverage. In rural areas and mountains, coverage may be more limited.
