As I recently tried to use a dual network using eSIM, I observed that while getting the call, the secondary service was disabled automatically, and then the secondary service would resume once the call was over.
If you're on a call and see No Service on your other line
Your iPhone can use one cellular data network at a time. When you're using one line to make a call, your other line shows No Service. If your carrier supports Wi-Fi Calling on your other phone number and you have Wi-Fi Calling turned on, you can answer incoming calls on that number. When you're on a call that isn't your default data line, you need to turn on Allow Cellular Data Switching.
Axel F.
If you're on a call and see No Service on your other line
Your iPhone can use one cellular data network at a time. When you're using one line to make a call, your other line shows No Service. If your carrier supports Wi-Fi Calling on your other phone number and you have Wi-Fi Calling turned on, you can answer incoming calls on that number. When you're on a call that isn't your default data line, you need to turn on Allow Cellular Data Switching.
Axel F.
When talking to the primary eSIM, the secondary SIM shows no service
