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