IMO Q2 Plus
Android 8.1 (Go edition)
1 Find "Call barring"
Press the phone icon.
Press the menu icon.
Press Settings.
Press Calls.
Press Call barring.
2 Turn call barring on or off
Press the required barring type.
Key in your barring password and press TURN ON. The default barring password is 1919.
1919
3 Return to the home screen
Press the Home key to return to the home screen.