1Before you start, make sure to back up any important data that is saved on the internal memory of your device to a memory card or other
2From your Home screen, tap 
.
3Find and tap Settings > Backup & reset > Factory data reset.
4To delete information, such as pictures and music, from your internal storage, mark the Erase internal storage checkbox.
5Tap Reset phone.
6To confirm, tap Erase everything.
Locking and protecting your device
IMEI number
Every device has a unique IMEI (International Mobile Equipment Identity) number. You should keep a copy of this number. If your device is stolen, your network provider can use your IMEI number to stop the device from accessing the network in your country.
To view your IMEI number in the device
1From your Home screen, tap 
.
2Find and tap Settings > About phone > Status.
3Scroll to IMEI to view the IMEI number.
Setting a screen lock
There are several ways to lock the screen on your device. For example, you can use the Face Unlock feature, which uses a picture of your face to unlock the screen. You can also set a screen unlock pattern, a
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 a screen lock
1From your Home screen, tap 
> Settings > Security > Screen lock.
2Select an option.
To set up the Face Unlock feature
1From your Home screen, tap 
> Settings > Security > Screen lock.
2Tap Face Unlock, then follow the instructions in your device to capture your face.
3After your face is successfully captured, tap Continue.
4Select a backup lock method and follow the instructions in the device to complete the setup.
The Face Unlock feature is less secure than a screen lock pattern, PIN, or password. Someone who looks similar to you could unlock your device.
For best results, capture your face in an indoor area that is well lit but not too bright, and hold the device at eye level.
To unlock the screen using the Face Unlock feature
1Activate the screen.
2Look at your device from the same angle you used to capture your Face Unlock photo.
If the Face Unlock feature fails to recognise your face, you need to draw the backup pattern or enter the PIN to unlock the screen.
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