I just got my new iPhone yesterday, and this morning I decided to try tethering. To my dismay, when I tried Internet tethering, it worked. I am on the $30 unlimited plan from AT&T. Is this because I restored from my jailbroken tethering enabled 3GS? Will AT&T catch on and change my plan? I don't use tethering, I just don't want to get billed extra. Thanks.