OPPO A57s
Turn fixed dialling on or off
When fixed dialling is turned on, you can only call selected numbers and do emergency calls. Incoming calls aren't affected.
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press Advanced settings.
Press Fixed dialling numbers.
Press the required SIM.
Press Enable FDN to turn on fixed dialling.
Key in the PIN2 and press the confirm icon.
Press Disable FDN to turn off fixed dialling.
Key in the PIN2 and press the confirm icon.
Press the Home key to return to the home screen.
1. 1. Find "Fixed dialling numbers"
2. 2. Turn on fixed dialling
3. 3. Turn off fixed dialling
4. 4. Return to the home screen