AT&T Continues to Delay U.S. iPhone Tethering Due to Concerns About Network Performance
Despite including internet tethering as a feature in iPhone 3.0, U.S. AT&T customers have yet to have the feature enabled. Engadget got a comment from AT&T about the absent feature. The response cites high traffic usage that could hamper n...
http://www.macrumors.com/2010/04/29/atandt-continues-to-delay-u-s-iphone-tethering-due-to-concerns-about-network-performance/