The upgraded network platform could allow for theoretical peak speeds of 7.2Mbps.
And this well in advance of their planned transition to 4G LTE networking in early 2011. Curiously, AT&T updated their EDGE platform just before the original iPhone 2G was released, and their 3G platform was made -- okay, slightly less thin -- before the iPhone 3G launched. So whatever could be prompting this latest speed boost?
(Thanks to Phil from WMExperts for the tip!)