Nokia Lumia 900 AT&T official Pictures. Nokia Lumia 900 AT&T is a Smartphone of nokia. The Nokia Lumia 900 AT&T Windows Mobile Smartphone. Announced Jan 2012. Features 4.3″ Display, Snapdragon S2 Chipset, 8 MP Primary Camera, 1.3 MP Front Camera, 1830 MAh Battery, 16 GB Storage, 512 MB RAM, Corning Gorilla Glass. Nokia Lumia 900 AT&T price starts.