Japan eSIM on KDDI
This is a data-only Japan eSIM: 12GB, 21GB or 30GB at full KDDI 5G/4G speed with no phone number, no voice calls and no SMS. Nothing is throttled and hotspot sharing is not capped, so you can put the whole allowance through a laptop if you want — which is what separates this plan from our unlimited Japan options, where the speed is held at 10Mbps or the hotspot has its own smaller allowance.
What you get
Starts: First connection
Use apps to call
5G/4G
Is it right for your trip?
- You need to keep a laptop or tablet online over hotspot without watching a tethering cap.
- You want full 5G speed rather than an unlimited plan capped at 10Mbps.
- You can estimate your total usage and pick an allowance that covers the trip.
- You are buying well ahead of the trip and want a long window to install.
- You want a plan you never have to watch — pick an unlimited option instead.
- You need a Japanese phone number for bookings, deliveries or verification codes.
- You need to make or receive ordinary cellular calls or SMS.
- You need continued data after the total allowance is used — service stops rather than slowing down.
From payment to connected
- 1Pick and pay
Choose a plan and tick the two checks.
- 2Get the email
Your QR code and install steps arrive by email.
- 3Install on Wi-Fi
Check when your days start, then install the eSIM.
- 4Land and connect
Switch your phone’s mobile data to the eSIM line.
Not sure your phone supports eSIM? Check the device list
Technical details
- Network
- KDDI (au)
- Network type
- 5G/4G
- Coverage
- Japan · KDDI (au) 5G / 4G
- Phone number
- None
- APN
- uad5gn.au-net.ne.jp
- Activation
- First connection
- Check data
- See your install email
- Data
- Validity
About this plan
Starts on first network connection
The plan begins when the eSIM first connects to the network, not when you buy it. Install before you travel and enable it after you land.
No number, calls or SMS
This plan cannot receive one-time passcodes by SMS and cannot place or take ordinary phone calls.
Data stops at the allowance
There is no reduced-speed continuation. When the 12GB, 21GB or 30GB is used, the data service ends.
Hotspot is uncapped, the plan is not
There is no separate limit on tethering, but everything you share still comes out of the plan's total allowance.
Install within 180 days
The eSIM must be installed within 180 days of purchase.
Compatible unlocked phone required
Confirm eSIM support and carrier-unlocked status before purchase.
Install on the final device
The QR code is for a single installation. It cannot be reinstalled or moved to another device.