I sort of get this, but I mostly don't. My iPhone 4, which is at this point ancient in comparison, can pick up all sorts of quiet sounds from different rooms. Like if Siri was on I could talk softly into my pants and she'd get the message the same as if I was talking loudly into my future pants that were trapped down a well in a basement. What's this got that my old phone doesn't have, except GAMES AND INTERNET AND TELEPHONE and stuff?