13
Battery
&
Charging
Charging
the
battery
Before
you
turn
on
and
start
using
GSM55,
it
is
recommended
that
you
charge
the
battery.
Only
the
power
adapter
and
USB
cable
provided
in
the
box
must
be
used
to
charge
the
battery.
Do
not
remove
the
battery
while
you
are
charging
it
using
the
power
or
car
adapter.
As
a
safety
precaution,
the
battery
stops
charging
if
it
overheats.
1.
POWER
ON
&
OFF
Switching
the
POWER
Button
on
Press
the
POWER
button
off.
Switching
the
power
off
1)
If
the
display
is
off,
press
the
POWER
button
to
turn
it
back
on,
then
unlock
the
screen.
2)
Press
and
hold
the
POWER
button
for
a
few
seconds.
3)
Tap
Power
off
on
the
options
menu.
