LG T-Mobile C1200 User Manual page 92

LCD does not turn on.
Remove and replace the battery and turn on the power. If the
phone still does not turn on, charge the battery and try again.
An echo can be heard during connection with a certain
telephone in a certain area.
It is called 'Echo Phenomenon'. It occurs if the volume is too
high or caused by special properties (semi electronic telephone
exchange) of the machine on the other end.
The phone gets warm.
During long calls, or if games/Internet are used for a long time,
the phone may become hot. This is perfectly normal and has no
effect upon the life of the product or performance.
The bell does not ring, or lamp or LCD blinks only.
The phone is set to 'Vibrate' or 'Quiet' in the Profiles menu.
Please select 'General' or 'Loud'
Standby duration of the phone gradually becomes shorter.
Batteries have a limited life. When the battery lasts for half its
original time, it requires replacement. Only use authorised
replacement parts.
Usage time of battery becomes shorter.
If the battery time is short, it may be due to the user
environment, or large volume of calls, or weak signals.
C1200 User Guide