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APPENDIX
Appendix 1 – Troubleshooting
If you find exceptions when operating your 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 contacts of the SIM
card are dirty.
Clean the SIM card
with a clean cloth.
Poor received
signal quality
Signals are obstructed.
For instance, radio waves
cannot be effectively transmitted
due to being nearby a high
building or you are located in
a basement.
Move to a place where signals
can be effectively transmitted.
Line congestion occurs when
you use your mobile phone in
high-traffic hours.
Avoid using your mobile phone
in high-traffic hours.
Your mobile
phone cannot
be powered on
The battery requires charging.
Charge the battery.
Calls cannot
be dialed
Call barring is activated.
Cancel call barring.
Your mobile
phone cannot
connect the
network
The SIM card is invalid.
Contact your network
service provider.
Your 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 incorrect charger is used.
Use the charger specially
designed for your mobile phone.
Poor contact.
Ensure the charger plug is
in good contact with your
mobile phone.
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