1. Find "Change SIM PIN"
Slide two fingers down the display starting from the top edge of your mobile phone.
Press Set up SIM card lock.
Press Change SIM PIN.
2. Change PIN
Key in your current PIN and press OK.
Key in a new four-digit PIN and press OK.
Key in the new PIN again and press OK.
3. Return to the Home screen
Press the home icon to end the session and return to the Home screen.