LG K11+

Press Settings.

Press General.

Press Fingerprints & security.

Press Set up SIM card lock.

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.

If the wrong PIN is entered three times in a row, your SIM is blocked. To unblock your SIM, you'll need to key in your PUK. The PUK can be obtained by contacting Customer Service. Please note: If the wrong PUK is entered ten times in a row, your SIM will be blocked permanently. In this case, you need a new SIM from Telstra.

Press the Home key to return to the home screen.