Hey, it is my understanding that the face detection sensors detect if the phone is at the users face and locks the screen from a button being accidentally pressed. Would this not also lock the screen if one where to put it in a case or holster of some kind? That is a feature I love in my CrackBerry, that it has a magnetic sensor that locks out the keyboard if slipped into a case. Keeps me from having to worry about locking the key pad. Thanks! I've got 8 days to convince myself to buy the iPhone 3G..