Galaxy S23

Slide two fingers downwards starting from the top of the screen.

Press the settings icon.

Press Security and privacy.

Press Other security settings.

Press Set up SIM card lock.

Press the indicator next to "Lock SIM card" to turn the function on or off.

Key in your PIN and press OK.

If an incorrect PIN is entered three times in a row, your SIM card will be blocked. To unblock your SIM card, you'll need to key in your PUK. The PUK can be obtained by contacting customer services. Please note: If you key in the wrong PUK ten times in a row, your SIM card will be blocked permanently. In this case, you need a new SIM card from T-Mobile.

Press the Home key to return to the home screen.