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91
Problem
Possible
causes
Possible
solution
to
send
out
signals
as
it
attempts
to
locate
a
base
station.
Doing
so
will
shorten
standby
time.
Flight
mode.
Cannot
switch
your
phone
on
Battery
power
has
been
depleted.
Recharge
the
phone’s
battery.
(U)SIM
card
error
(U)SIM
card
malfunction
or
damage.
Take
the
(U)SIM
card
to
your
service
provider
for
testing.
(U)SIM
card
inserted
improperly.
Insert
the
(U)SIM
card
properly.
Debris
on
the
(U)SIM
card
contacts.
Use
a
soft,
dry
cloth
to
clean
the
(U)SIM
card
contacts.
Unable
to
connect
to
the
network
(U)SIM
card
invalid.
Contact
your
service
provider.
You
are
not
within
the
network’s
service
area.
Check
the
service
area
with
your
service
provider.
Poor
signal.
Move
to
an
open
space,
or
if
you
are
inside
a
building,
move
closer
to
a