One of the more unique features in the iPhone is its trio of sensors (orientation, light, and proximity -- the latter two are behind the glass right above the earpiece) which help the device interact with its user and the world at large. Some of these sensors are more useful than others. The light sensor (for dimming the backlight) is great for saving power, but its use doesn't compare to the the other two sensors, which worked like champs. The proximity sensor, which prevents you from accidentally interacting with the screen while the iPhone is pressed against your ear, switches off the display...