127
Problem
Possible causes
Possible solution
base station. Doing so
consumes battery
power and will
consequently shorten
standby time.
Cannot
switch your
device on
Battery power has
been depleted.
Recharge the device
’s
battery.
SIM card
error
SIM card malfunction
or damage.
Take the SIM card to
your service provider
for testing.
SIM card inserted
improperly.
Insert the SIM card
properly.
Debris on the SIM
card contacts.
Use a soft, dry cloth to
clean the SIM card
contacts.
Unable to
connect to
the network
SIM card invalid.
Contact your service
provider.
You are not within the
network’s service
area.
Check the service area
with your service
provider.