ND-508 Manuale d’uso
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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 congestions 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
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