Originally Posted by TheBiles
That's only for the "More Everything" plans. It costs extra for everyone else either as an add-on or a more expensive data tier.
Sent from my HTC One M8
From what I understood, unless if you're still on a grandfathered plan of any type (maybe specifically unlimited data grandfathered, I'm not sure), wifi tethering is supposed to be free. Unless if you have proof otherwise, I'm going to stick with my belief.
That being said, I still have unlimited data, and I'm only going to give it up when they pry it out of my cold, dead fingers, so regardless of their actual policies, it doesn't affect me. Besides, now that we have S-Off and full root, free tethering should be relatively simple once someone figures out how to do it, if it hasn't already been solved.