![Zte Z855 User Manual And Safety Information Download Page 107](http://html1.mh-extra.com/html/zte/z855/z855_user-manual-and-safety-information_941259107.webp)
107
Problem
Possible causes
Possible solution
PIN Code
blocked
You have entered an incorrect
PIN code three consecutive
times.
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.
Phone
crashes,
reboots,
freeze, or
cannot be
powered on
Some third-party software is
not compatible with your
phone.
Uninstall the software that may cause the
problem.
Upgrade the phone software.
Reset the phone to factory status.