1. Find "Fixed dialling numbers"
Press the call icon.
Press the menu icon.
Press Settings.
Press Calling accounts.
Press the name of the SIM.
Press Fixed dialling numbers.
2. Turn on fixed dialling
Press Enable FDN.
Key in your PIN2 and press OK.
3. Turn off fixed dialling
Press Disable FDN.
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.