Is it hard to believe we’re already on the fourth iteration of the iPhone? It seems like only yesteryear we were struggling for anything better than Edge speeds and many for any other carrier than AT&T. Actually, it’s still tied to AT&T but quite a bit has changed in the three years since its existence. Take a look at this video that pits the iPhone, iPhone 3G, iPhone 3GS, and iPhone 4 against each other in a number of speed comparisons. You’d think the iPhone 4 would win everything, right?