1. Find "SIM card lock"
Slide your finger downwards on the display.
Press the settings icon.
Press SIM card lock.
2. Change your PIN
Press Change SIM 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.