155
Have no mobile
signal
in
a
dialing jam time
e.g.when
duty
on or duty off
Avoid
to
use
mobile in a remote
place
Too far from the
frequency
transmiting
tower
Ask the network
operator
to
announce
the
network overlay
A
regional
problem
caused by a
bad network
relay wire
Echo
or
cacophony
Some
areas
relay wire is not
so good.
Hand
up
and
redial, maybe can
change
network
relay wire
Standby time is
related to the
network system
setting
Turn of the mobile
when
in
weak
signal area
Standby time
becomes
short
Need to change
the battery
Use a new battery