Interesting.
Some people were thinking that ATT was the limiting factor, but a review in Australia says their iPhone (on a 7+Mbps 3G network) still topped out at 1.4Mbps... apparently proving that Apple limited the speed on the phone itself, to save battery.
http://apcmag.com/unauthorised_first_australian_review_of_iphone_3g.htm
Some people were thinking that ATT was the limiting factor, but a review in Australia says their iPhone (on a 7+Mbps 3G network) still topped out at 1.4Mbps... apparently proving that Apple limited the speed on the phone itself, to save battery.
http://apcmag.com/unauthorised_first_australian_review_of_iphone_3g.htm