actually that's not totally true. yes, samsung would have to make each model carrier specific in that it would need to work on the right bands, but they could release a phone with bands to cover At&t and Tmob pretty easily. the problem lies with us, the customers and to a certain extent the carriers. we would see more and more timely releases if we were willing to forgo the subsidized pricing models.
buy a phone outright irrespective of the carrier and makers would than likely include us in the global launch.