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Troubleshooting
This chapter lists some problems you might encounter when using your phone. Some
problems require you to call your service provider, but most are easy to fix yourself.
Message
SIM or USIM
card error
No network
connection/
Dropped
network
Codes do not
match
Possible causes
There is no SIM or
USIM card in the
phone or it is inserted
incorrectly.
Signal is weak or you
are outside the carrier
network.
Operator applied new
services.
To change a security
code, must confirm
the new code by
re-entering it.
The two codes you
entered do not match.
Possible corrective measures
Make sure that the SIM card is
correctly inserted.
Move toward a window or into an
open area. Check the network operator
coverage map.
Check whether the SIM card is more
than 6~12 months old. If so, change
your SIM card at your network
provider's nearest branch. Contact your
service provider.
If you forget the code, contact your
service provider.
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