iPhone won't start anymore after the reboot code was sent to me
So a class mate of mine sent me this iphone restart message that restarts your iPhone and makes your iMessage crash. It wasn't funny, that's for sure. My phone did not simply restart, it kept restarting and then crashed down again but I managed to get my phone working by using the finger-unlocking system, iMessage didn't work though, I just thought I could be ok with that until the Update comes out.
Later on, someone sent that message to a whatsapp group chat. Now my iPhone won't start anymore, the finger-unlocking method doesn't work and it's very very hot. I seriously don't know what to do right know, also the battery is empty and when I charge it connect and disconnects. Is there anybody who can help me? I can't Apple Support now.
I'm thankful for ANY advice..
iPhone 6