I was wondering this the other day. Does Facetime require an active connection to the Internet to work? By this, I mean if you have two iPhone4 users on the same wifi network (not connected to the Internet), can they use facetime to v-chat? I'm thinking if you're in a work environment where you can't attach wifi routers to the network, could I bring in an old wifi router and just plug in the power? Then anyone with an iPhone4 could connect to this network just for Facetime (and perhaps stuff like filesharing, printersharing, etc). Can anyone with access to 2 iPhone4's do an experiment?