The Apple iPhone 4S remains king of the hill at America's third-largest carrier. All of the major carriers that offer it sell it for $200, $300, or $400, depending on storage. And with the next-generation iPhone just around the corner, there may only be one month left for Samsung to overtake the iPhone at Sprint. There's little doubt the new iPhone will grab the top spot – perhaps simply stepping in for the 4S, which has held it at Sprint since its debut in October 2011.