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The SIM card is
installed incorrectly
Remove the card
and insert it again.
The SIM card is dirty or
damp.
Wipe the terminals of the
SIM card with a dry piece
of cloth.
An error of connection with the network
The SIM card is
damaged.
Check the SIM card
condition. If it is
damaged, contact the
network operator.
No GSM service signal.
Contact the network
operator.
Too poor signal.
See below: poor signal
Poor signal
Too far distance from
the network base
Try again from another
place.
Network overload.
Try again later.
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Содержание MM820 Plus
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