It is for EDGE, but Cingular charges the same for HSDPA/UTMS as for EDGE-only phones. And when T-Mobile rolls out their UTMS, it should stay the same price. (And since the iPhone is only EDGE, it doesn't really matter, now does it?)
It does matter. Why pay more for less?
If someone offered you ISDN 128KB speed for the same price as someone offered cable modem or DSL speeds, would you take ISDN?