Iphone hacked displaying messages
Hello! I think my iPhone 6 have been hacked or I can't tell if it's a bad joke. A few minutes ago it started displaying messages (as shown in the attached picture - "You started to freak out?", followed by "this is just the beginning"), threatening me (the person who hacked into the phone knows personal stuff about me). The messages can be closed and the phone goes back to the home screen. How could someone remotely enter my phone? What should I do?
iPhone 6, iOS 8.2