28
Using phone within areas of poor
signals, such as surroundings of high
buildings or in a basement where
wireless electric waves are
unreachable.
Receiving calls in a position with good
signals.
Poor signals
Using phone during the period of busy
communications, which results in a
channel jam and inability of
communicating.
Avoid being within such a situation or
similar.
Fail to power on
Power of battery has run out.
Charge it or replace it with a new one.
Fail to make a call
Function of barring calls started.
Disable function of barring calls
SIM card invalid
Please contact your network operator
Out of GSM service area
Please move your phone into service area
of network operator.
Fail to connect to
network
Poor signals
Please move your phone to places with
strong signals then try again.
Voltage of battery in use not in the
range specified by charger.
Please use batteries of which the voltage
is in the range.
Using a non-standard charger
Please use a charger designed for this
type of phone.
Fail to charge
Not well plugged.
Check the plug to see if it’s well
connected.
