The study was performed by Metrico Wireless, a mobile device performance analytics firm. To test network performance, Metrico made 6,000 voice calls, conducted 8,000 data download/upload tests (both moving and stationary), and downloaded more than 21,000 web pages.

With regard to maximum data speeds, AT&T led the pack at 6,047Kbps, with Verizon a distant second at 2,371Kbps, and Sprint crawling in last with only 1,767Kbps. It’s unclear, however, exactly where Metrico tested data bandwidth, and as any iPhone-toting San Francisco resident will tell you, data quality can be terrible in areas with high concentrations of tech geeks. – Via Wired

All I have to say is wow, this is a random data speed test I recently did with my iPhone 4S on AT&T.