Define 'mobile broadband'. Is that like tethering from your phone if you do it officially? I'm under the impression 'hotspot' would be more like if you have one of those wifi cards. Will the actual data through my phone to ONLY my phone still remain unlimited?
If not, Sprint is going to be in a world of hurt. This is the only thing keeping people there right now. Their service is okay, their 3G speed is pathetic. If they implement this before they roll out Network Vision, there is absolutely ZERO reason to stick with them. After Network Vision is a maybe, as then maybe the speeds will be something sort of useful.