No Battery Charging Icon Appears When Phone Starts Charging; The Battery Performance Is Low; My Wired Headset Does Not Work; I Cannot Transfer Content Between My Phone And The Computer, When Using A Usb Cable - Sony Xperia ion LT28at User Manual

To perform a factory data reset
To avoid permanent phone damage, do not restart the phone while a reset procedure is
underway.
1
From your Home screen, tap
2
Find and tap Settings > Backup & reset.
3 Tap Factory data reset > Reset phone.
4 To 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 14.

My wired headset does not work

• Make sure the wired headset that you are using complies to the CTIA standard. Your
phone supports the CTIA standard, and may not be fully compatible with other
standards such as OMTP.
• If you have a wireless headset that is compatible with your phone, try using that
instead.
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 35 for more information.
SIM card 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 PUK locked
You have entered your PUK (Personal Unblocking Key) incorrectly 10 times in a row.
Please contact AT&T.
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