Operation Manual

57
Problem Possible causes Possible solution
(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
window.
You cannot
answer incoming
calls.
You have activated the Call
Barring feature.
Go to Settings
> Calls > Call
barring, and then
select Cancel all call
barring.