your phone has the technology, but Sprint dumbs down your phone so they can try to make extra money. just root your phone and use your hotspot to your heart's content.
Which, the solution for that is just as easy (perhaps easier): UnRoot your phone; it's quick/easy, they'll fix it (under warranty), then just Re-Root it.
There's no way for them to tell if a phone was ever Rooted.
Boom. Mind blown.