In 3.1.3 I was jailbroken and noticed that in Settings/General/Network there is an option for internet tethering. I am somewhat sure that it is illegal to tether AT&T so I never messed with it and thought it was from something I had downloaded from cydia. Now on iOS4 I still see this option. I did use a backup but nothing else is appearing. Why is internet tethering there if it is illegal?