OPPO Reno 5G
Turning call barring on or off
You can block certain types of calls such as incoming calls when you're abroad.
Press the phone icon.
Press the settings icon.
Press Carrier Call Settings.
Press Call Barring.
Press the indicator next to the required barring type to turn the function on or off.
Key in your barring password.
Press the Home key to return to the home screen.