OPPO A57 4G
Android 12.0
1. Find "Fixed dialling numbers"
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press Advanced settings.
Press Fixed dialling numbers.
2. Turn on fixed dialling
Press the required SIM.
Press Enable FDN to turn on fixed dialling.
Key in the PIN2 and press the confirm icon. The default PIN2 is 1111.
1111
3. Turn off fixed dialling
Press Disable FDN to turn off fixed dialling.
Key in the PIN2 and press the confirm icon. The default PIN2 is 1111.
1111
4. Return to the home screen
Press the Home key to return to the home screen.