Microsoft announced on Wednesday that its mobile operating system Windows Phone is now officially available in China. The company confirmed the launch on its Windows Phone blog on Wednesday. The first Windows Phone-powered handset to be released in the region is the HTC Eternity, known as the HTC Titan in the United States. It features a huge 4.7-inch display, a 1.5GHz single-core Snapdragon processor, an 8-megapixel wide-angle rear camera, a 1,600 mAh battery and a sleek unibody aluminum case. The Eternity will initially only be available unlocked. China is expected to surpass the U.S. this year to become the top smartphone market in the world by subscriber volume, and the total number of mobile subscribers in the country recently topped 1 billion.