Put your iPhone on a flat surface with the GLASS SIDE DOWN (also known as the screen) and press each corner. Does it wobble? I can't believe how people can mess this up. I'm asking for you to take your iPhone, place it on a flat surface (like a smooth table) with the screen side down and gently tap each corner with your finger. Does it wobble at all? If it does wobble, then your iPhone is slightly twisted. If your bothered by it, gently twist it back to normal by twisting it with your hands. Hint: it takes VERY LITTLE force to correct this. Don't over-do it.