1 Find "Set up SIM/RUIM card lock"
Slide your finger downwards starting from the top right side of the display.
Press SETTINGS.
Press SETTINGS.
Press Security.
Press Set up SIM/RUIM card lock.
2 Turn use of PIN on or off
Press Lock SIM card to turn the function on or off.
Key in your PIN and press OK.
3 Return to the home screen
Press the home icon to return to the home screen.