LG LGM320N.AIBRKU, User Manual, Page: 368 / 376

Appendix 117
FAQ
This chapter lists some problems you might encounter when using your
device. Some problems require you to call your service provider, but most
are easy to fix yourself.
SIM card error
Make sure the SIM card is correctly inserted.
No network connection or dropped network
Signal is weak. Move to a window or an open area.
You are outside the carrier network area. Move and check the network.
Calls are not available
New network not authorized.
Make sure you have not set call barring for the incoming number.
Make sure you have not set call barring for the number you are dialing.
Device cannot be turned on
When the battery is completely discharged, your device will not turn on.
Fully charge the battery before turning on the device.
Charging error
Make sure device is charging at a normal temperature.
Check the charger and its connection to the device.
Use only in-box accessories which are authorized by LG.