My iPhone is on constant reboot
Ok so I got a new iPhone 4 a few days ago for Christmas from my parents (I know it's an old type iPhone) and it was working fine up until now. so I was getting music from iTunes from my computer (Windows) and my phone froze. So I clicked back up on iTunes. It backed up but the screen went black but it was the sort of black that you'd know it was on so I searched online on how to restart phone. I pressed and held for ten seconds but it just went to restore mode, and then back to reboot continuesly, any ideas?