S4 locked me of it ?

[AC Question]

My phone just all of a sudden is asking me to type pin code but i never seen this screen before i dont use a pin to lock it i use a pattern so idk what to do because it is saying it will reset to factory settings after 4 more attempts! Whats going on why and how did this happen ?

 

[B. Diddy]

Welcome to Android Central! Anyone else tampering with your phone, like your kids, or "friends" who might have been playing a prank on you?

Try using Android Device Manager to remotely reset the PIN: https://support.google.com/nexus/answer/3388218?hl=en