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Failed to connect to the
network
The SIM card is invalid.
Contact your network service provider.
Beyond the GSM coverage.
Consult the network service provider
for service areas.
The signal is feeble.
Retry at a stronger signal area.
Failed to make a call
The call barring feature is used.
Cancel the call barring settings.
The fixed dialing number feature is
used.
Cancel the fixed dialing number
settings.
PIN code error
Enter incorrect PIN codes for three
times in succession.
Contact your network service provider.
Failed to charge the
battery
The battery or the charger is damaged.
Change a new battery or charger.
Charge the battery when ambient
temperature is lower than -10
℃
or above
50
℃
.
Change the environment.
Poor connection.
Check whether the plug is properly
connected.
Failed to add contacts to
phonebook
The storage space of phonebook is
used up.
Delete some contacts from the
phonebook.
