My cell phone was blocked

Good afternon. Two days later my cell phone was blocked with a Avast security message "this cell phone was lost ou stolen). To unblock they ask a PIN number, but I don’t have idea which is!! Please help me. I logged my Avast but my cell was not in the list!!

http://www.avast.com/faq.php?article=AVKB127#artTitle (Restore forgotten PIN)