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5 Appendix
Appendix 1
：
Troubleshooting
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
congestion
occur when
you use the
mobile phone
in high-traffic
hours
Avoid using the mobile phone in high-traffic hours
The mobile
phone cannot
be powered on
The battery
energy is
exhausted.
Charge the battery
