How to turn the SIM PIN on your Apple iPhone 11 Pro on or off

Press Settings.

Press Mobile Service.

Press SIM PIN.

Press the indicator next to 'SIM PIN' to turn the function on or off.

0000

0000

Key in your SIM PIN and press Done. The default SIM PIN is 0000.

If an incorrect SIM PIN is entered three times in a row, your SIM will be blocked. To unblock your SIM, you'll need to key in your PUK. Sign in to the O2 website to get the PUK. Please note: If you key in the wrong PUK ten times in a row, your SIM will be blocked permanently. In this case, you need a new SIM from O2.

Slide your finger upwards starting from the bottom of the screen to return to the home screen.