It's no secret that T-Mobile is on the cusp of lighting up its first LTE network in Las Vegas, but with Kansas City soon to follow -- and ambitions of extending LTE coverage to 100 million Americans by mid-year -- it's time to start factoring this consideration into your next smartphone purchase. While the carrier's HSPA+ 42 network is certainly speedy, there's no point in saddling yourself with a device that's rooted in the past. Want to make sure you're ready for what comes next? Read on for everything you need to know.Filed under: Cellphones, Wireless, Mobile, T-MobileComments