New flagship smartphone launches are often accompanied by a rush of users trading in older phone models as they upgrade, and data surrounding which models saw increased trade-in volumes can give us a good idea of where business is coming from as people purchase new phones. If data provided to BGR by Gazelle is any indication, early Galaxy S5 buyers were already Samsung device owners in large part, with a comparably small amount of new business coming over from the iPhone. According to data from leading gadget trade-in service Gazelle, the volume of used Samsung phones being sold using the company’s site exploded on April 11th, the day Samsung’s Galaxy S5 went on sale at all four nationwide U.S. wireless carriers. The firm’s data shows that Samsung