Zte GRAND X4 User Manual page 159

Problem
Cannot turn
your phone on
nano-SIM card
error
Unable to
connect to the
network
Cannot make
outgoing calls
Possible causes
If you are not able to
connect to the network, the
phone will continue to send
out signals as it attempts to
locate a base station. Doing
so consumes battery power
and will consequently
shorten standby time.
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
Fixed dialing numbers
feature.
Possible solution
Change your location to one
where the network is
accessible, or temporarily
turn off your phone.
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
Use Fixed Dialing
159
Numbers.