Screen won't rotate
My screen started not rotating but when I use my friends iPhone 4S and my iPod 4g they rotate an I don't know why my didn't
iPhone 4S, iOS 6.1
Press the HOME button if not on the 1st home screen already. Wait a second, then double press it. Slide the ribbon that appears at the bottom of the screen from left to right to reveal the rotation lock icon and tap it.