Hisense U40 - Calls cannot be dialed; The mobile phone cannot connect the network; The battery cannot be charged

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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