What you do with your phone is essentially your business. Rooted phones enjoy much much more ability than just tethering, and my android phone is indeed rooted. Do I tether? No. Mostly because despite the fact AT&T offers 2GB, It's just as easy for me to do much the same things on my phone without hooking it to my laptop and risk chugging a quarter of my monthly quota up just to check my email. Yes, computers are that data hungry and on any typical system once you install a proper antivirus, and browser, I wouldn't doubt for a minute that it's easy to spot unauthorized tethering by simply inspecting packets, mostly because computers also tend to send out packets and leave ports open that no handset would. XD
Still, most of my usage is tame compared to most. Though if AT&T ever did silently opt me in to such a plan for choosing to tether, I'd probably terminate and call it a breach of contract. (Fortunately they have been texting, and emailing customers who they see this activity from and giving them a chance: "Stop tethering now, or continue tethering and we WILL opt you into a tethering plan". Is this fair? Not entirely in my opinion, but we're stuck with this behavior until the FCC grows a pair. :/
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