I can't imagine a tattle phone being useful in society generally (the risks, I would think, outweigh the benefits) but this article about a tattle phone in a preschool makes for interesting listening (be sure to read the transcript on This American Life). "It is everything-- and rules. They live by rules. They can sit down to play a game, and that whole playtime will be nothing but arguing about the rules. And then there's no playtime left, and they feel good about it."