AT&T announced on Wednesday that it will launch the HTC Titan Windows Phone on November 20th for $199.99 on contract. The carrier touted the Titan as “the largest screen in our smartphone portfolio” alongside launch details in a post on its Facebook page. HTC’s Titan features Microsoft’s latest Windows Phone operating system, Mango, along with a massive 4.7-inch display, a 1.5GHz Snapdragon processor and a gorgeous unibody aluminum design. BGR reviewed the Titan last month, and we called it a class-leading handset in terms of hardware, though it was a bit too large for our taste. We very much enjoyed the snappy combination of Windows Phone 7.5 and Qualcomm’s 1.5GHz Snapdragon chipset, however, and the new 8-megapixel camera surprised us with images that can compete with the best camera phones on the market.