How to set up your Japan eSIM — 5 steps
- 1
Check compatibility
Settings → Cellular → 'Add eSIM' (iPhone) or Settings → Connections → SIM Manager → 'Add SIM' (Android). If the option exists, you're good.
- 2
Buy your plan
Choose the number of days that matches your Japan trip. For first-timers, 7 days is the most common choice. Complete checkout — you'll get a QR code by email immediately.
- 3
Scan the QR code
Open your email at home (you need Wi-Fi for this step). On iPhone: Settings → Cellular → Add eSIM → Use QR Code. On Android: Settings → Connections → SIM Manager → Add SIM → Scan QR. Follow prompts.
- 4
Set it as your data line
After installing, set the Japan Wireless plan as your default data. iPhone: Settings → Cellular → Cellular Data → select the new plan. The plan activates when your phone first connects in Japan.
- 5
Land, connect, explore
Turn off Airplane Mode when you land. Your phone registers with KDDI or NTT DOCOMO automatically. Open Google Maps — if it shows Japan, you're connected.
Which phones support eSIM for Japan?
iPhone
- iPhone XS / XS Max / XR (2018)+
- iPhone 11, 12, 13, 14, 15, 16
- All models: Pro, Plus, Pro Max
Samsung Galaxy
- S20, S21, S22, S23, S24, S25
- Z Fold 2+ and Z Flip 3+
- Note 20 series
Google Pixel
- Pixel 3a and newer
- Pixel 4, 5, 6, 7, 8, 9
- All Pro models
Note: Some phones sold in Japan (Japanese market variants) or locked to specific carriers may have eSIM restrictions on dual-SIM use. If unsure, the quickest check is Settings → Cellular → Add eSIM on your device.
Frequently Asked Questions
What is an eSIM?
An eSIM (embedded SIM) is a digital SIM card built into your phone. Instead of inserting a physical plastic SIM card, you scan a QR code and your phone downloads the carrier profile digitally. For Japan travel, this means you can buy and activate a data plan before you leave home — your phone connects to the Japanese network automatically when you land.
How do I know if my phone supports eSIM?
Most phones bought after 2020 support eSIM. Confirmed compatible: iPhone XS/XR (2018) and all newer iPhones, Samsung Galaxy S20 and newer, Google Pixel 3a and newer, and most flagship Android phones. The easiest check: go to Settings → Cellular (iPhone) or Settings → Connections → SIM Manager (Android) and look for 'Add eSIM' or 'Add Mobile Plan'. If the option exists, your phone supports eSIM.
Do I need to remove my existing SIM card?
No. The eSIM is a second SIM profile that sits alongside your existing SIM. Your home phone number and calls/texts keep working (if you have international roaming on your home plan). The Japan Wireless eSIM handles data only — it provides internet for apps like Google Maps, WhatsApp, and Instagram. You keep your home number for calls.
When should I activate the eSIM?
Activate the eSIM at home, before your flight. Installation takes 2 minutes — scan the QR code in your email, follow the on-screen prompts, and set the Japan Wireless eSIM as your data plan. The data countdown begins when you first use it in Japan, not when you install it. So install it a week in advance if you prefer.
What if the eSIM doesn't connect at the airport?
If the eSIM shows as installed but no signal: (1) Make sure your data is set to use the Japan Wireless profile (not your home carrier's data roaming). iPhone: Settings → Cellular → Cellular Data → select Japan Wireless plan. Android: Settings → Connections → SIM Manager → Mobile Data → select the eSIM. (2) Turn Airplane Mode on and off. This forces the phone to re-register with the local tower. Email [email protected] if issues persist — English support is available.
Do I need Wi-Fi to activate the eSIM?
Yes — you need a Wi-Fi or existing data connection to download the eSIM profile when scanning the QR code. Activate at home before your trip. If you forget, airport Wi-Fi at your departure airport will work.
5 minutes now saves 40 minutes of airport queuing.
Set it up at home · Connected automatically on landing · English support
Also helpful