Why is my phone asking me to enter a privacy protection password to unlock?

[AC Question]

i changed the sim card of my phone and after rebooting the device, it shows a lock page saying " please enter privacy protection password to unlock". this page don't have Google log in method even.
please help me out....

 

[B. Diddy]

Welcome to Android Central! Is the new SIM from the same carrier? Ask them if they have any input. Did you set a SIM lock at some point?