The HTC 8X is the first of four new entrants to our top sellers list in November, and also the first of two Windows Phone-based smartphones to make the list. The 8X sold for $150 in its debut month at T-Mobile, but the carrier was offering a special through Dec. 3 that let you pick one up for free, with a new, two-year service agreement and some rebates. The 8X comes with what the company calls a "world-class camera"; a dual-core, 1.65 GHz processor; and a 4.3-inch touchscreen with 720p HD resolution.