Internet Abroad: Overseas Wi-Fi & eSIM
Living in Japan, you will sometimes need internet abroad — visiting your home country or traveling for work. Using your Japanese phone abroad can be expensive, so it helps to prepare a connection that suits your destination. This guide covers your options by destination.
1. Three ways to get online abroad
| Option | Best for | Notes |
|---|---|---|
| Overseas Wi-Fi rental | Groups; keep using your own phone | Rent a router and take it with you. Share with family. Needs pickup/return |
| eSIM | Solo; a compatible phone | Set up via QR code. No physical SIM, no return. Check device support |
| Local SIM | Long stays; familiar with the country | Buy on arrival. Often cheaper but takes effort to buy and set up |
2. Recommendations by destination
Going to / from China
China's network environment differs from Japan, and some services may be restricted. A China-specific rental Wi-Fi uses a line tuned for local use (availability may vary by environment).
Going to Taiwan
A popular short trip. Taiwan-specific Wi-Fi routers offer plans that are easy to use without worrying about data caps.
Going to Singapore
For business, layovers and travel — connect right after arrival with a Singapore-specific Wi-Fi.
Other countries / easy eSIM
An eSIM that works across many regions just needs a QR scan on a compatible phone. No charging or return — great for business trips and multi-country travel.
3. How to set up an eSIM
- Check your phone supports eSIM (look for "eSIM"/"EID" in settings; SIM-free device)
- Order the service and receive a QR code
- Go to Mobile Data → Add eSIM and scan the QR
- Turn on "Data Roaming" at your destination to start
4. Prices and cautions
- Prices, data and coverage change by service and season — check each official site.
- Speed and quality depend on the local environment; we cannot guarantee a connection.
- For China, network restrictions may apply and whether specific apps work depends on the environment — check each service's guidance first.
- For Wi-Fi routers, confirm the pickup/return method and deadline (airport, delivery, etc.).
FAQ
Can I use my Japanese phone abroad as-is?Yes with roaming on, but it tends to be expensive. An overseas Wi-Fi rental or eSIM is usually cheaper, so prepare before you travel.
How do I check if my phone supports eSIM?Look for "eSIM" or "EID" in your phone settings and make sure it is SIM-free. Most newer iPhone and Android models support it.
Will messaging apps and SNS work in China?China has network restrictions and availability depends on the environment. We cannot promise they will work — check each service's guidance first.
Can my family share it?A Wi-Fi router connects several devices, so families and groups can share. An eSIM is generally for one phone.
Sources
* Rules may change. Please check official sites for the latest information.
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