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Query your subscription information (quota, validity of SIM card, etc.) from your service
Confirm with your service provider if your SIM card is valid.
Try to select a network manually.
Retry later if the network is too busy.
SIM card error
Make sure that the SIM card has been inserted correctly (see 2.1 Insert SIM card).
Query from your service supplier if your SIM card is compatible with 3V (the old 5V SIM card cannot
be used).
Make sure that the contacts in your SIM card are not smudgy, damaged, or scratched.
I cannot make calls
Ensure that you have dialed correct numbers and pressed the Dial key.
For international toll calls, ensure that the country code and area code are used.
Ensure that your phone has found the network and the network is not busy.
Make sure that you are not restricted in calls due to owing fees.
Query your subscription information (quota, validity of SIM card, etc.) from your service
provider.
Make sure that call barring is not set in your phone (see 5.5.2. Call Settings).
Check if you have set the fixed dialing function (see 5.5.4 Security Settings).
I cannot answer calls
Make sure your phone has been switched on and connected to the network (check if the
network is overloaded or no network is found).
Make sure that your incoming calls are not barred due to owing fees.
