I've written to my members of Congress to get the FCC to step in and forbid extra charges for tethering. If I pay for 2 GB of data, it's irrelevant HOW I consume it. I've paid for it and it's mine to use as I see fit! The idea of charging ANY fee based on my method of connecting is asinine! If I go over my data limit, either with the phone OR notebook, I get charged for it. AT&T actually could MAKE money legitimately from excess data usage.
I asked Congress to step in because they've done it before. Many years ago, the Plain Ol' Telephone Service ("POTS") used to charge extra for EACH jack in your home. They claimed it was a convenience to have a jack in other rooms and customers had to pay for it.
If we follow AT&T Wireless' flawed logic, then the "POTS" should charge an extra fee for hooking up a cordless phone to your line. Since it allows you to move from room to room more freely, you might talk on the phone more and that could increase your usage. That argument doesn't stand up because, if you're on a limited plan, you pay extra when you go over, regardless of whether you use a wired phone or a cordless one.
The FCC also stopped Cable Companies from charging extra per TV outlet. This happened when "cable ready" TV came out. Equipment rental fees for converter boxes are exempt.
It's time for GREEDY Cell Phone Companies to be forced to STOP this unjustifiable gouging!