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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 card
error
No network
connection/
Dropped
network
Codes do
not match
28
Possible causes
There is no SIM
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,
you will need
to confirm the
new code by
re-entering it.
The two codes
you have 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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