So far I've managed to drop my iphone twice from around knee height. Using the bumper and PS (front and back) for protection. The phone is fine on the outside and works. However, I can't help but wonder if these mishaps have still somehow damaged the glass. I read somewhere that the type of glass Apple uses for the newest iphone can have microscopic fractures...which I presume could make it more likely that my phone brakes with little or no trauma in the future. I know I'm being ridiculous but should I take it in for a replacement?