You have seen the videos. This one has been watched over 2 million times:
Well, now the poor iPhone 4S has some armor that can stand up to a .50 caliber machine gun. At $650, it costs the same as a new iPhone and it is heavier than an EVO. So, it is not for everyanyone. As mentioned below, though, you should probably not worry too much about your iPhone if you are getting .50 cal bullets shot at you.