The Tier 1 carriers are all touting their respective "4G" mobile broadband offerings. But what about the small, rural carriers? Many rural operators are taking the lead and forging ahead with their own plans, thanks in some cases to federal broadband stimulus money. FierceBroadbandWireless mapped out the plans--technology, spectrum and operations--of more than a dozen rural providers.  Mobile broadband opens up a new ball game that enables operators to not only target under-served areas with voice services, but also offer fast Internet access. Special feature