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If you tether, no matter what way you do it, packets are still sent the same way and AT&T would be able to find out. Packet analysis can reveal that you're tethering. AT&T could easily inspect your HTTP traffic and look at the user-agent flag, which would report you are using a desktop browser. Same for sending emails through a desktop client. They could also easily look at what servers you are connecting to - if they see connections to the Microsoft Windows Update service, they'll know that's coming from a computer, and not your phone.
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I am on a drug. It's called Charlie Sheen. It's not available. If you try it once, you will die.