Zte Axon 7 User Manual page 146

Problem
PIN Code
blocked
Phone
crashes,
reboots,
freeze, or
cannot be
powered on
Possible causes
You activated the Fixed
dialing numbers feature.
You entered an incorrect
PIN code three consecutive
times.
Some third-party software is
not compatible with your
phone.
Possible solution
Disable this feature. For
more information, see
Fixed Dialing
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.
Uninstall the software that
may cause the problem.
Upgrade the phone
software.
Reset the phone to factory
status.
146
Use
Numbers.