LG put out a trio of headlining smartphones at Mobile World Congress, and we've had the chance to try all three. The Optimus 4X HD is clearly the star: with a quad-core Tegra 3 and a 4.7-inch, 720p display, it's one of the more powerful devices at the show. Read on for its take as well as looks at the Optimus Vu and Optimus 3D Max.
