Device Guides
Samsung Galaxy S21 5G
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How to
Turn use of PIN on or off
Your PIN protects your SIM from unauthorised use if your mobile phone should get stolen. If use of PIN is turned on, it needs to be keyed in when you turn on your mobile phone.
Slide two fingers downwards starting from the top the screen.
Tap the settings icon.
Tap Biometrics and security.
Tap Other security settings.
Tap Set up SIM card lock.
Tap the required SIM.
Tap the indicator next to "Lock SIM card" to turn the function on or off.
0000
0000
Key in your PIN and tap OK. The default PIN is 0000.
If an incorrect 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. The PUK can be obtained by contacting Customer Service. Please note: If an incorrect PUK is entered ten times in a row, your SIM is blocked permanently. In this case, you'll need a new SIM from Optus.
Tap the Home key to return to the home screen.
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