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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
Micro-USIM
card error
There is no
Micro-USIM card
in the phone
or it is inserted
incorrectly.
Make sure that the Micro-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 Micro-USIM card
is more than 6~12 months old. If so,
change your Micro-USIM card at your
network provider's nearest branch.
Contact your service provider.
Codes do
not match
To change a
security code,
you will need
to confirm the
new code by
re-entering it.
If you forget the code, contact your
service provider.
The two codes
you have entered
do not match.
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