Can I use an eSIM and a physical SIM card at the same time?

Yes, you can use it if your smartphone supports simultaneous use (i.e., a dual-SIM compatible model).

Many eSIM-compatible smartphones allow you to set up both an eSIM and your regular SIM card at the same time.

For example, you can use your Japanese SIM card for calls and SMS, while using the overseas eSIM for data/internet access.

You can also switch between SIMs depending on your travel destination. *The number of SIMs and the combinations that can be used simultaneously vary by smartphone model.

For details, please check with your device manufacturer or mobile carrier.