T-Mobile today announced that it will sell the Nokia Lumia 710 starting January 11 for $49.99 after rebate with a new contract. The device is the first Nokia Windows Phone Mango product to officially be sold in the U.S. The hardware is unchanged from the international version of the 710, which was announced in October, but it has T-Mobile-branded content, such as T-Mobile Live TV, MyAccount and the new Nokia ESPN-powered Sports Hub and Nokia Drive for mapping and routing. The Lumia 710 features a 3.7-inch WVGA display with Nokia’s ClearBlack technology; 1.4GHz single core SnapDragon processor with 512MB of RAM, and 8GB of storage; HSPA Category 10 at 14.4Mbps down and 5.76Mbps up, Bluetooth 2.1, Wi-Fi, and GPS. It has a 5-megapixel camera with autofocus, LED flash, and video capture at 720p HD. It will be available in either black or white. T-Mobile USA also said that Windows Phone will play a more prominent role in its smartphone lineup through 2012, though it didn't announce any specific new phones.