1. 1. Find "Set ‹SIM› lock"
Press Security & privacy.
Press More settings.
Press Encryption and credentials.
Press Set ‹SIM› lock.
2. 2. Turn use of PIN on or off
Press the required SIM.
Press the indicator next to "Lock SIM card" to turn the function on or off.
Key in your PIN and press OK.
3. 3. Return to the home screen
Press the Home key to return to the home screen.