1 From your Home screen, tap .
2Find and tap Settings > Privacy.
3Tap Factory data reset.
4To erase not only internal storage but also other user data such as pictures and music, mark the Erase SD card checkbox.
5Tap Reset phone.
6To confirm, tap Erase everything.
No battery charging icon appears when phone starts charging
It may take a few minutes before the battery icon appears on the screen.
The battery performance is low
Follow our smart tips on how to get more out of your battery. See Improving battery performance on page 15.
I cannot transfer content between my phone and the computer, when using a USB cable
The software or the USB drivers have not been properly installed. Go to www.att.com/tutorials for more detailed installation instructions and troubleshooting information.
Error messages
No network coverage
•Your phone is in Airplane mode. Make sure Airplane mode is turned off.
•Your phone is not receiving any network signal, or the received signal is too weak. Contact AT&T and make sure that the network has coverage where you are.
•The SIM card is not working properly. Insert your SIM card in another phone. If this works, it is probably your phone that is causing the problem. In this case, contact the nearest Sony service center.
Emergency calls only
You are within range of a network, but you are not allowed to use it. However, in an emergency, some network operators allow you to call the international emergency number 112. See Emergency calls on page 34 for more information.
SIM card is locked.
You have entered your PIN incorrectly 3 times in a row. To unlock the phone, you need the PUK provided by your operator.
SIM card is
You have entered your PUK (Personal Unblocking Key) incorrectly 10 times in a row. Please contact AT&T.
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