To perform a factory data reset
To avoid permanent damage to your device, do not restart your device while a reset procedure is underway.
1From your Home screen, tap 
.
2Find and tap Settings > Backup & reset.
3Tap Factory data reset.
4If you also want to erase data such as pictures and music which are saved to your device's internal storage, mark the Erase internal storage checkbox.
5Tap Reset phone.
6To confirm, tap Erase everything.
Locking and protecting your device
IMEI number
Every phone has a unique IMEI (International Mobile Equipment Identity) number. You should keep a copy of this number. If your phone is stolen, your network provider can use your IMEI number to stop the phone from accessing the network in your country.
To view your IMEI number
•Remove the cover to view your IMEI number.
To view your IMEI number in the phone
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.
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