To perform a factory data reset
To avoid permanent damage to your device, do not restart your device while a reset procedure is underway.
1Drag the status bar downwards, then tap 
.
2Find and tap Backup & reset> Factory data reset.
3If you also want to erase data such as pictures and music, which is saved to your device's internal storage, mark the Erase internal storage checkbox.
4Tap Reset phone.
5To 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
•Turn off your device, then remove the battery cover and battery to view your IMEI number.
•Open the phone dialer on your device and enter *#06#*.
To view your IMEI number in the device
1From your Home screen, tap 
.
2Find and tap Settings > About phone > Status.
3Tap IMEI information.
SIM card protection
You can lock and unlock each SIM card that you use in your device with a PIN (Personal Identity Number). When a SIM card is locked, the subscription linked to the card is protected.
If you enter the PIN incorrectly more times than the maximum number of attempts allowed, your SIM card will become blocked. You then need to enter your PUK (Personal Unblocking Key) and a new PIN. Your PIN and PUK are supplied by your network operator.
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