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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 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 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.
Codes do not
match
To change a security
code, must 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.