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The 3G
Smartphone 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 3G Smartphone
Poor contact
Ensure the charger plug is in good contact with the 3G
Smartphone