A new carrier file has been added to iPhone 4.0 Beta 4, now version 6.2 up from version 6.0, that has brought back the hopes of native tethering for iPhone users on the AT&T network.( Something every other network has already been enjoying). Now when going to the network settings in the Settings.app you have a pop up for enabling tethering, and to contact AT&T either via a call or the website.
Going to the web site, and logging into the OLAM(online accounts manager) there are no tethering features yet to add. So next we will have to place a call during business hours…stay tuned for that.