Here's another little story about 3G/4G in the US. AT&T and Cingular started deploying UMTS in 2004 and were disappointed with the performance. Then they started rolling out HSDPA, which worked better, but hardly anyone actually used it. Then the iPhone came out and people suddenly started using high-speed data services, not because the iPhone was the first phone to offer them but because the iPhone bypassed a lot of AT&T's content control and presented web-based applications in a useable manner. What AT&T discovered, though, was that they forgot to install enough BACKHAUL bandwidth to support the air interface. Now, data rates to iPhones are often limited not by the air interface but by the cruddy little T1 lines that tie the network together. AT&T is scrambling to upgrade, probably looking to WiMax as a way out of this. I'm not sure exactly what my point is here, but it's an interesting story that relates to several topics we've discussed.