LG GT400 User Manual page 294

Trouble Shooting
Message
Phone cannot
be switched on
Charging error
Phone loses
network
Number not
permitted
66
Possible causes
On/Off key pressed too
briefly
Battery empty
Battery contacts dirty
Battery totally empty
Temperature out of range
Contact problem
No mains voltage
Charger defective
Wrong charger
Battery defective
Signal too weak
The Fixed dial number
function is on.
Possible Corrective
measures
Press On/Off key for at least
two seconds.
Charge battery. Check charging
indicator in the display.
Clean contacts.
Charge battery.
Make sure the ambient
temperature is right, wait for a
while, and then charge again.
Check power supply and
connection to the phone.
Check the battery contacts,
clean them if necessary.
Plug in to a different socket or
check voltage.
If the charger does not warm
up, replace it.
Only use original LG
accessories.
Replace battery.
Reconnection to another
service provider is automatic.
Check settings.