I don't know about iPhones specifically, but I know I used to sigh and grit my teeth every time I'd debug something networking-related while I was at a public coffee house or something, and there's all those apple laptops, broadcasting the user's registered name on the local network for lord only knows what reason.

They may well be trying to stop something equally stupid happening where someone decided it would be a good idea to blast the user's name and phone number out over the local network.