Don't know passcode for iPhone, iPhone disabled connect to iTunes.

Okay, so my friends think it is funny to change the passcode on my iPhone. The worst thing about it is they can't remember what they set the passcode as. I've now been locked out of my iPhone. It appears on the screen "iPhone is disabled. Connect to iTunes." but when I connect my iPhone to iTunes, it says "Do you want to allow this computer access information on "iPhone"? If you don't allow access, you will not be able to manage or sync your iPhone with this computer"

When I click continue, it says "To allow access, please respond on your iPhone..." but nothing comes up on my iPhone except from "iPhone is disabled. Connect to iTunes."

I also have the app "Find My iPhone" enabled, but for some odd reason it won't connect to my Wi-Fi when it normally does.

It would be great if someone who has experienced this or knows how to fix it, that could help me. Thank you. 🙂