1. Find "SIM card lock"
Slide your finger down on the display.
Press the settings icon.
Press SIM card lock.
2. Change your PIN
Press the name of the SIM.
Press Change SIM PIN.
Key in your current PIN and press the confirm icon.
Key in a new four-digit PIN and press the confirm icon.
Key in the new PIN again and press the confirm icon.
3. Return to the Home screen
Press the home icon to end the session and return to the Home screen.