Overmax Vertis 02 plus User Manual page 46

The mobile phone
cannot be powered
on
Calls cannot be
dialed
The mobile phone
cannot connect the
network
The battery cannot
be charged
The battery energy
is exhausted.
Call barring is
activated
The SIM card is
invalid
The mobile phone
is not in a service
area of the GSM
network
The signal is weak
The charging
voltage does not
match the voltage
range indicated on
the charger
An improper
charger is used
Charge the battery
Cancel call barring
Contact your network service
provider
Move to the network operator's
service area
Move to a place where the signal
quality is high
Ensure the charging voltage
matches the voltage range
indicated on the charger
Use the charger specially
designed for the mobile phone