1. Find "Call barring"
Press the phone icon.
Press the menu icon.
Press "More" below the name of your SIM.
Press Call barring.
2. Activate or deactivate call barring
Press the indicator next to the required barring type.
Key in your barring password and press OK.
3. Return to the Home screen
Slide your finger upwards starting from the bottom of the display to return to the Home screen.