154
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.
Poor signal.
Move to an open space,
or if you are inside a
building, move closer to a
window.
Unable to
enter
information
into the
phonebook
The phonebook’s memory
is already full.
Delete unnecessary data
from the contacts.