Zte BLADE A512 User Manual page 144

Problem
Cannot turn
your phone
on
nano-SIM
card error
Unable to
connect to
the network
Cannot
answer
incoming
calls
Possible causes
Battery power has been
depleted.
The nano-SIM card
malfunctions or is
damaged.
The nano-SIM card is
inserted improperly.
There is debris on the
nano-SIM card contacts.
The nano-SIM card is
invalid.
You are not within the
network's service area.
The signal is poor.
You have activated the
Call barring feature.
Possible solution
Recharge the phone's
battery.
Take the nano-SIM card
to your service provider
for testing.
Insert the nano-SIM
card properly.
Use a soft, dry cloth to
clean the nano-SIM card
contacts.
Contact your service
provider.
Check the service area
with your service
provider.
Move to an open space,
or if you are inside a
building, move closer to
a window.
Disable this feature. See
Bar Certain
144
Calls.