This feature is 50% useful and 50% useless. The LED will only flash if the screen is locked. If you have the home screen up then it will not flash. Another feature that is useless is if you have the slient switch on the LED will still flash when the screen is locked. So if you are in the movie theatre and have your phone on silent the LED will flash and annoy people in the theatre. Is there any link I can use to provide feedback to apple?