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Echoes or noises
Shorter standby time
Failed to turn on your phone
SIM card error
Failed to connect to the network
Failed to make a call
PIN code error
Failed to charge the battery
Failed to add contacts to phonebook
The trunk line of network is in bad
condition. It is a regional problem.
In some areas, the call lines are in
bad condition.
The standby time is relevant to
network settings.
Replace the batteries
When no signals are received, your
phone will continue searching for
base stations, thus consuming a
large amount of battery power and
reducing standby time.
The battery power is used up.
The SIM card is damaged.
The SIM card is not properly installed. Ensure the SIM card is properly
The metallic face of the SIM card is
contaminated.
The SIM card is invalid.
Beyond the GSM coverage.
The signal is feeble.
The call barring feature is used.
The fixed dialing number feature
is used.
Enter incorrect PIN codes for three
times in succession.
The battery or the charger is
damaged.
Charge the battery when ambient
temperature is lower than -10°C or
above 55°C.
Poor connection.
The storage space of phonebook
is used up.
51
Hang off the call and dial again.
Choose another better line.
In poor reception areas, turn off
your phone temporarily.
Change with a new battery.
Use your phone at strong signal
areas or Turn off the phone
temporarily.
Check the battery power level or
charge the battery.
Contact your network service
provider.
installed.
Wipe the face with a clean cloth.
Contact your network service
provider.
Consult the network service
provider for service areas.
Retry at a stronger signal area.
Cancel the call barring settings.
Cancel the fixed dialing number
settings.
Contact your network service
provider.
Change a new battery or charger.
Change the environment.
Check whether the plug is properly
connected.
Delete some contacts from the
phonebook.
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