AT&T will launch Nokia’s highly anticipated Lumia 900 smartphone in March, Nokia revealed on Thursday. While the company failed to make any concrete release details available during its press conference at the Consumer Electronics Show earlier this week, preliminary launch details were included in a developer newsletter the Finnish vendor sent out on Thursday. “The Nokia Lumia 900 phone runs Microsoft Windows Phone 7.5,” the newsletter read. “It is the biggest and fastest smartphone yet. And it will become available exclusively through AT&T in March.” BGR took a hands-on look at the Nokia Lumia 900 earlier this week, and it is easily one of the best Windows Phone handsets we have handled to date. Beyond the sleek design, the Lumia 900 features a 1.4GHz Snapdragon processor, a 4.3-inch ClearBlack AMOLED display, 4G LTE and a user experience that ranks among the best available on a modern smartphone.