OPPO Reno13 Pro 5G
It's not possible to receive voice calls
Solution 3 of 4: Barring of incoming calls is turned on
You can block certain types of calls such as incoming calls when you're abroad.
Press the call icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press Operator-related settings.
Press Call barring.
Press the required barring type.
Key in your barring password.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.