HTC’s highlight of Mobile World Congress is the new HTC Desire 816 (formerly known as the HTC Desire 8). HTC is pitching its largest Desire series phone as a “flagship mid-range” since it comes equipped with a 5.5-inch 720p display, 1.6GHz quad-core Snapdragon 400 SoC, 1.5GB of RAM, 8GB of internal storage, microSD expansion (up to 128GB), 2,600mAh…