Maxcom MM820 User Manual page 67

Gsm mobile phone
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Echo or noise
Disconnect and dial the
number again. This may
Local problems with a
connect you with another
poor signal
network transmitter.
An error occurs while adding a new contact
Remove the existing
contacts to provide free
The mobile memory
memory
full
An error of a function setting
Contact with the network
operator.
The function is
unavailable or served by
the network.
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