Nintendo may be the undisputed king of the handheld gaming market, but more than one company over the years have attempted to give the Big N a run for their money. The Wonderswan, PSP and Sega Game Gear are all great examples of Nintendo facing resistance to its solid monopoly. One name absent from that list? Microsoft’s Xbox Division, as that platform has shied away from going mobile. For good reason as well, as Xboss Phil Spencer revealed.