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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
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
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