What do people get wrong about SIM cards, eSIM and pocket Wi-Fi in Japan?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Connectivity is the second most searched practical topic after money. The market has shifted sharply toward eSIM since 2023, and much older advice about airport counters and rental routers is now the expensive option.
The options
| Option | Cost (typical, 2025) | Best for | Catch |
|---|---|---|---|
| Travel eSIM (bought online) | ¥1,500–4,000 for 7–15 days, several GB or unlimited | One phone, recent model | Phone must be carrier-unlocked and eSIM-capable |
| Physical prepaid SIM (airport or shop) | ¥3,000–6,000 for 15–30 days | Older phones | Data-only; passport ID checks are being introduced under a 2026 amendment to the mobile-phone fraud law — carry your passport |
| Pocket Wi-Fi rental | ¥450–1,000 per day (unlimited plans from about ¥440/day) | Groups, laptops, tablets | Another device to charge and return |
| Free Wi-Fi | ¥0 | Occasional use | Coverage is patchy; hotels are reliable, streets are not |
- Japan's networks (NTT Docomo, KDDI au, SoftBank, Rakuten) provide 4G LTE nationwide and 5G in cities. Tourist eSIMs ride on Docomo or SoftBank in most cases.
- Tourist SIMs cannot receive SMS or calls in most products. Two-factor codes from your home bank will need your home SIM active on roaming or a dual-SIM setup.
- Japan has shut down all its 3G networks (au March 2022, SoftBank January 2024, Docomo 31 March 2026); very old phones will not connect.
[Verify] Prices are observed 2025 ranges. 3G shutdown dates with each carrier's announcement before publication.
Misunderstanding 1｜Free Wi-Fi covers a city trip
Convenience stores, stations and cafés offer it, but registration pages, time limits and gaps between hotspots make it unreliable for maps. Budget for data.
Misunderstanding 2｜eSIM works on any phone
It needs an eSIM-capable, unlocked phone. Phones bought on contract in some countries are locked; check with your carrier before leaving.
Misunderstanding 3｜You will lose your home number
Keep your home SIM installed for calls and texts (roaming for SMS is usually cheap or free) and use the travel eSIM for data. Turn off data roaming on the home SIM to avoid charges.
Misunderstanding 4｜Pocket Wi-Fi is a waste of money
For three or more people sharing, or anyone needing a laptop online all day, a rental router is still competitive and charging one device is manageable.
Misunderstanding 5｜Buy it at the airport counter
Airport counters are convenient but the most expensive point of purchase, and queues at peak hours can be long. Buying an eSIM online before departure means you land connected.
---
Sources
- Ministry of Internal Affairs and Communications — Mobile services for foreign visitors
https://www.soumu.go.jp/main_sosiki/joho_tsusin/eng/
- Japan National Tourism Organization — Internet and Wi-Fi
https://www.japan.travel/en/plan/wifi-and-connectivity/
- NTT Docomo / KDDI / SoftBank — network and 3G termination notices (English)
https://www.docomo.ne.jp/english/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
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