Huawei P30
Android 9.0
1 Find "Fixed Dialling Numbers"
Press the phone icon.
Press the menu icon.
Press Settings.
Press More.
Press Fixed Dialling Numbers.
2 Turn on fixed dialling
Press Enable FDN to turn on fixed dialling.
Key in your PIN2 and press OK.
3 Turn off fixed dialling
Press Disable FDN to turn off fixed dialling.
Key in your PIN2 and press OK.
4 Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.