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 in the device
1From your Home screen, tap 
.
2Find and tap Settings > About phone > Status.
3Scroll to IMEI to view the IMEI number.
SIM card protection
The SIM card lock only protects your subscription. Your device will still work with a new SIM card. If the SIM card lock is on, you have to enter a PIN (Personal Identity Number). If you enter your PIN incorrectly more times than the maximum number of attempts allowed, your SIM card will become blocked. You need to enter your PUK (Personal Unblocking Key) and then a new PIN. Your PIN, PIN2 and PUK are supplied by your network operator.
To enable the SIM card PIN lock
1From the Home screen, tap 
.
2Find and tap Settings > Security > Set up SIM card lock > Lock SIM card.
3Enter the SIM card PIN and tap OK.
To change the SIM card PIN
1From the Home screen, tap 
.
2Find and tap Settings > Security > Set up SIM card lock > Change SIM PIN.
3Enter the old SIM card PIN and tap OK.
4Enter the new SIM card PIN and tap OK.
5
To change the SIM card PIN2
1From the Home screen, tap 
.
2Find and tap Settings > Call settings > Fixed dialing 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 unlock a locked SIM card
1Enter the PUK code and tap OK.
2Enter a new PIN code and tap OK.
3
If you enter an incorrect PUK code too many times, the SIM card becomes locked. If this happens, contact your service provider to get a new SIM card.
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