I can tether very well, wired or wireless, with my phone. And I can assure you, its not a feature one would use a lot. If you have a smartphone, u just dont lug your laptop everywhere. Of course, ATT will not hear this kind of arguments, ever, because they usually dont listen to their customers' feedback.
Oh, I forgot to mention, this is on an Android phone, unlocked and rooted. Talk about mobile OS supremacy...