1. Find "Set SIM 1 lock"
Press Security & privacy.
Press More settings.
Press Encryption and credentials.
Press Set SIM 1 lock.
2. Activate or deactivate use of PIN
Press the indicator next to "Lock SIM card" to activate or deactivate the function.
Key in your PIN and press OK.
3. Return to the Home screen
Slide your finger upwards starting from the bottom of the display to return to the Home screen.