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If you find exceptions when operating the mobile phone, restore the factory settings and
then refer to the following table to solve the problem. If the problem persists, contact the
distributor or service provider.
Fault
Cause
Solution
SIM card error
The SIM card is damaged.
Contact your network service provider
The SIM card is not in position.
Check the SIM card
The metal face of the SIM card
is polluted.
Clean the SIM card
with a clean cloth
Poor received
signal quality
Signals are obstructed. For instance,
radio waves cannot be effectively
transmitted nearby a high building
or in a basement.
Move to a place where signals
can be effectively transmitted
Line congestions occur when
you use the mobile phone
in high-traffic hours
Avoid using the mobile phone
in hightraffic hours
The mobile phone
cannot be powered
on
The battery energy is exhausted.
Charge the battery
Calls cannot be
dialed
Call barring is activated
Cancel call barring
The mobile phone
cannot connect
the network
The SIM card is invalid
Contact your network service provider
The mobile phone is not in a service
area of the GSM network
Move to the network operator’s
service area
The signal is weak
Move to a place where
the signal quality is high
The battery cannot
be charged
The charging voltage does not match
the voltage range indicated
on the charger
Ensure the charging voltage matches
the voltage range indicated
on the charger
An improper charger is used
Use the charger specially designed
for the mobile phone
Poor contact
Ensure the charger plug is in good
contact with the mobile phone
Appendix 2: Troubleshooting
