walkaround? I can do them just by removing my sim card! Of course iPhone SHOULD be able to do that, because what if we upgrade our phones? What if I want to buy a new ATT phone TOMORROW? why can't I use my iPhone still as an iPod? Of course I should be able to, right? Yes, and indeed I can, cuz I just tested it without a SIM CARD.
The real walkaround should be for phones that HAVE NOT been activated.