Zte Z557BL User Manual page 153

Problem
Cannot turn
your phone on
nano-SIM card
error
Unable to
connect to the
network
PIN Code
blocked
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.
nano-SIM card malfunction
or damage.
nano-SIM card inserted
improperly.
Debris on the nano-SIM
card contacts.
nano-SIM card invalid.
You are not within the
network's service area.
Poor signal.
You have entered an
incorrect PIN code three
consecutive times.
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.
Contact your service
provider. If the service
provider provides the
nano-SIM card's PUK code,
use the PUK code to unlock
the nano-SIM card.
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