LG GT540 User Manual page 222

Troubleshooting
Message
Number not
permitted
Impossible to
receive/ send
SMS & Picture
Files not open
SD Card not
working
No Sound
Hang up or
freeze
90
Possible causes
The Fixed Dial
Number function
is on.
Memory Full
Unsupported file
format
FAT 16 file system
supported only
Vibration or
manner mode
Intermittent
software problem
Possible Corrective Measures
Check settings.
Delete some existing messages in the
phone.
Check the file format that can be
supported
Check SD card file system via card reader
Or format SD card using phone
Check the setting status of sound menu
to make sure you are not in vibrate or
silent mode.
Take out the battery and insert battery.
Turn on the phone.
Try to do software update service via
WEB site.