And then there were three. AT&T's lonesome LTE duo -- the Samsung GS II Skyrocket and HTC Vivid -- just gained a new member with the recent launch of LG's Nitro HD. You may recognize this particular handset from its former life as the Optimus LTE, except here the phone's been rebranded with a moniker that more astutely conveys its blazing 4G purpose. There may be tough times ahead for the handset, considering the current crop of high-end devices hogging the spotlight. But if three's company, the Galaxy Nexus, HTC Rezound and Droid RAZR are sure to make this a standing room-only crowd -- an especially haughty bunch given their heavyweight specs. Which is why this sudden end-of-year release for the Nitro HD has us questioning the company's timing. Sure, it's no slouch when stacked up against the competition, with a 4.5-inch 1280 x 720 AH-IPS display, dual-core 1.5GHz Qualcomm APQ8060 processor and 1.3 front-facing / 8 megapixel rear cameras. Yet at $250 on contract, the Nitro HD needs to outshine the legacy set by its best-in-class Sammy stablemate or, at least, offer a performance boost over the cheaper Vivid. So can LG's last second contender rise above the fray to win your holiday dollars? Will it succeed in outclassing its LTE compadres? Or is it a case of too little, too late for this me too three! smartphone. Follow on past the break as we dive into the mobile nitty gritty.