Doro Liberto 820 Mini
Android 4.4.2
1 Find" Call Setup"
Press Phone.
Press the Menu key.
Press Call settings.
Press Call Setup.
2 Turn call barring on or off
Press the field below "Call barring".
Press the indicator next to the required barring type to turn the function on or off.
Key in your barring password and press OK. The default barring password is 0000.
0000
Press the confirm icon.
3 Return to the home screen
Press the Home key to return to the home screen.