I kept hearing that the iPhone had sold millions of units and assumed most of those phones were here in the US.  Turns out AT&T, the only carrier with the iPhone in the US, has only activated 4.3 million iPhones.  According to Fortune, iPhone 3G activations were down 21% quarter to quarter.  Surprisingly the iPhone is still outpacing the sale of RIM’s BlackBerry Storm.  I think the sale of T-Mobile’s G1 in this context is amazing…