LG D213n User Manual page 206

Message
Number not
allowed
Impossible
to receive /
send SMS &
photos
Files do not
open
The screen
does not turn
on when I
receive a call.
No sound
Hangs up or
freezes
94
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Possible causes
The Fixed dialling
number function
is on.
Memory full
Unsupported file
format
Proximity sensor
problem
Vibration mode
Intermittent
software problem
Possible corrective measures
Check the Settings menu and turn the
function off.
Delete some messages from your
phone.
Check the supported file formats.
If you use a protection tape or case,
make sure it has not covered the area
around the proximity sensor. Make
sure that the area around the proximity
sensor is clean.
Check the settings status in the sound
menu to make sure you are not in
vibration or silent mode.
Try to perform a software update via
the website.