Microsoft CEO Steve Ballmer joined Elop on stage briefly to praise the device and set expectations high for increasing Windows Phone sales for AT&T. And Ralph de la Vega, head of wireless for AT&T, predicted that with the Lumia 900, "Nokia will be back in the U.S. in a very big way."
January 9, 2012 5:04 PM PST
Photo by: Lori Grunin/CNET
| Caption by: CNET News staff