Nokia will be officially pulling back the curtains later on tonight, but the cat’s out of the bag: the company’s first U.S. Windows Phone is the Lumia 710, which will debut on T-Mobile with a $50 price tag on January 11.Sure, it isn’t as svelte or as colorful as its brother the Lumia 800, but the Mango-powered 710 does share the same internals. The Lumia 710 sports a 1.4 GHz Snapdragon processor, 512MB of RAM, and 8GB of internal storage – nothing that sounds super-impressive, but we’ve seen before that Mango doesn’t need the latest and greatest hardware in order to run like butter.