Your device must meet the following conditions:
1) eSIM compatible
2) Network unlocked
3) Compatible with KDDI 4G/5G
See here for frequencies used by KDDI
povo2.0 Japan SIM conforms to "au" frequency band
4) APN and network connection configured for povo
iOS
- Ensure your iOS is up to date (no manual APN profile installation is required)
Android
- Configure APN
- See here for details
Refer to: Sign-up and download eSIM profile > Android > Step 22
Can't connect the Internet after APN configuration?
Be sure to check in advance whether your device complies with the technical standards set by the Ministry of Internal Affairs and Communications. Mobile phones that comply with the technical standards have a technical conformity mark. Using a mobile phone that does not have a technical conformity mark is a violation of the Radio Law in Japan, and we may refuse to allow it to connect to our network. For details, please see the Ministry of Internal Affairs and Communications website.
Even if your device does not have a technical conformity mark, if you are using a device in Japan that is capable of international roaming based on an international roaming agreement with an overseas carrier, you do not need to undergo inspection when connecting to our line. For details, please see the Ministry of Internal Affairs and Communications website.
We shall not be liable for any events arising from the use of a SIM card in a mobile phone or other device sold by another company, except in cases where this is due to our willful misconduct or gross negligence.