To change the SIM card PIN2
1From the Home screen, tap 
.
2Find and tap Settings > Call settings > Fixed dialling numbers > Change PIN2.
3Enter the old SIM card PIN2 and tap OK.
4Enter the new SIM card PIN2 and tap OK.
5Confirm the new PIN2 and tap OK.
To unblock a locked SIM card
1When Enter PUK and new PIN code appears, enter the PUK code.
2Enter a new PIN code and tap OK.
If you enter an incorrect PUK code too many times, the SIM card becomes blocked. If this happens, contact your service provider to get a new SIM card.
Setting a screen lock
To set a screen lock
1From your Home screen, tap 
> Settings > Security > Screen lock.
2Select an option.
It is very important that you remember your screen unlock pattern, PIN or password. If you forget this information, it may not be possible to restore important data such as contacts and messages. Refer to Sony Customer support for more information.
To set up the Face Unlock protection
1From your Home screen, tap 
> Settings > Security > Screen lock.
2Tap Face Unlock, then follow the instructions in your phone to capture your face.
3After your face is successfully captured, set up screen lock Pattern or PIN as a backup method to unlock the screen. For more information, refer to 'To create a screen unlock pattern' or 'To create a screen unlock PIN'.
The Face Unlock feature is less secure than a screen lock pattern, PIN, or password. Someone who looks similar to you could unlock your phone.
For best results, capture your face in an indoor area that is well lit but not too bright and hold the phone at eye level.
To unlock the screen using the Face Unlock feature
1Activate the screen.
2Look at your phone from the same angle you used to capture your Face Unlock photo.
If Face Unlock fails to recognise your face, you need to draw the backup pattern or PIN to unlock the screen.
To disable the Face Unlock protection
1From your Home screen, tap 
> Settings > Security > Screen lock.
2Draw your backup screen unlock pattern or enter your PIN.
3Tap Slide.
To create a screen unlock pattern
1From the Home screen, tap 
.
2Find and tap Settings > Security > Screen lock > Pattern.
3Follow the instructions in your phone. You are asked to select a security question that will be used to unlock the phone if you forget your screen unlock pattern.
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