I recently got a text message from AT&T letting me know that I was "enjoying" free tethering with my iPhone, and that I would need to change my habits or be forced to upgrade to an official tethering plan. For all intents and purposes, I will refer to this as the "text of death."
This text of death from AT&T didn't surprise me. We reported awhile ago that AT&T was beginning to crack down on tethering that wasn't sanctioned through their official tethering plan.
What surprised me was that I thought I'd been careful, meaning, I thought I'd played it safe with how much I'd been tethering. After calling AT&T, I discovered some interesting information that might help those of you in a similar position.