Zte WCDMA User Manual page 77

Problem
PIN Code
blocked
Unable to
enter
information
into the
phonebook
Phone
crashes,
reboots,
freeze, or
cannot be
powered on
Possible causes
You have entered an
incorrect PIN code three
consecutive times.
The phonebook's
memory is already full.
Some third-party
software is not
compatible with your
phone.
Possible solution
Contact your service
provider. If the service
provider provides the
(U)SIM card's PUK
code, use the PUK code
to unlock the (U)SIM
card.
Delete unnecessary
data from the contacts.
Reset the phone to
factory status.
Enter safety mode and
uninstall the software
that may cause the
problem.
Upgrade the phone
software.
77