1. Find "SIM card lock"
Slide your finger down on the display.
Press the settings icon.
Press SIM card lock.
2. Activate or deactivate use of PIN
Press the name of the SIM.
Press Lock SIM Card to activate or deactivate the function.
Key in your PIN 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.