Since about April, I have received three text messages claiming that I have been tethering devices to my iPhone 3G S to use its data plan. The last message arrived today, stating that AT&T was switching my data plan to a $45 a month tethering plan, which included 4GB of data. Seeing how I have never tethered, this has gotten me rather angry. When I received the first message, I called AT&T and was met with an idiot that kept repeating, "Don't do it again". I hung up and let it go. When I received the second message, I demanded that the manager that took my escalation research/investigate the matter and stop the messages. When I received the last message, I became livid and shared my anger(though, in as polite a manner as possible) with the person to initially took my call, her manager, and that manager's manager. The area manager I talked to stated that the manager that was supposed to call me back never did, so she would set an "expectation" that I would not tether again. I was in such a hurry to get off the phone(had an appointment), that I just ended the call. Still, I do not understand why I keep getting these text messages. I do have my iPhone 3G S "jailbroken", but I do not have any tethering apps installed. I do have My3G installed(I would rather watch viewable YouTube videos, not garbage), but no tethering apps. To me, AT&T is just attempting to scare off the heavier data users, or push them to more expensive plan. Though, I have only used 33GB of data over the past 15 month, so I am far from a "heavy" user. My girlfriend works for AT&T, in a top tier data support group, so I would not want to carry the possibility of negatively reflecting on her. As such, I would not even considering attempting to tether any of my other devices to my iPhone. That and we only have EDGE coverage at our house, and we have to pay Verizon $50 for a data connection so my girlfriend can do AT&T business. This week, I did download a few Bill Cosby comedy albums and an album from another comedian. I also downloaded a few songs, but none of the individual downloads exceeded 20MB, so the My3G would not have to alter anything to download the albums. Outside of that vacation, I have not been away from home, or anywhere near AT&T's paltry UMTS coverage. Why am I getting these messages? Is the My3G app causing this? Is AT&T full of *****, and just looking to bump yet another customer off of the $30 "unlimited" data plan? I have not, nor will ever be interested in tether my laptop, or other devices, to my iPhone for data access. If I was interested, then I would have built my house in an area that has UMTS coverage, and would not be bleeding money to Verizon for crappy and limited data coverage. On second thought, I would have built my house in an area coverage by AT&T's more crappy DSL footprint. Who else has been accused of tether, when they have not been, and have any of you figured out what other apps might be causing these "flags", or is AT&T just attempting to strip the remaining customers of their "unlimited" data plans?