I plan on getting the $29 apple bumper for the new iPhone. However I am anal about front and back scratches. I have always uses a back silicone civet along with a front screen protector. Seeing that the bumper only covers the edges and raises a little protector both the front and back. But that doesn't help if there's a direct car key contact while in your pocket. The bumper has no way to protect the back since the car keys may hit it at an odd angle. So do they make back screen protectors for the iPhone 4?