Maybe Apple is moving into the MVNO market. Apple through its cash reserves buys up large tracks of prepaid minutes from various carriers where iPhone/world iPhone would be available. Your phone would have to be programmed with a base carrier. For me that would be ATT. Say I leave my base carrier's coverage area, by going up to Thunder Bay, Ontario. My phone should now sense that I'm out of normal coverage. Instead of auto-roaming, it should pop-up with warning message and ask me if I want to roam or buy airtime on Rogers, Telus, etc through iTunes. If I complete the purchase, I get wireless airtime without getting charged by ATT for roaming. There is nothing on the carriers to maintain account wise because this would be an itunes transaction. I know kind goofy but one way a mutant GSM iphone could be feasible.