i didn't realize it would let you use it at all, unless you signed up for the plan??? but yes, it has the "capability" of becoming a hot spot. however, they don't consider data used by another device as part of your "unlimited" data plan. your phone can use unlimited data....but if you want to tether, you have to add that $20 per month plan (you get 2 gigs for that, and they charge $20 per every 2 gigs that you go over it). they just can't let you tether all your stuff with just the $30 plan. everyone would drop their home internet servers and tether....and their network can't handle that. i'd run my wii, laptop, pc, and tv, off of the hotspot if it was included in the $30. that's A LOT of bandwidth usage. it's a bit misleading though.
Why not just cap the tether data at 3 Gig or something their network can handle? They already have limits on unlimited plans anyway, as ironic as that is.
Because they can't screw their customers out of an additional $20 bucks a month and claim that it is to preserve their network.