Test of 3G networks in the US

Gizmodo recently ran a test of 3G networks in the US. The results are here. AT&T had the fastest average upload and down load speeds in the cities where the test was conducted. This is a bit of a surprise given the heat that the AT&T network has been taking recently from iPhone users. Gizmodo wonders whether it is the iPhone or some interaction between the iPhone and the AT&T network, and I can see why. These test results don't corroborate the belief that AT&T's network is (only) at fault.