The Nokia Lumia 900 AT&T was announced in 2012, January. Released 2012, April With 4.3 inches, 52.6 cm2 (~60.1% screen-to-body ratio) AMOLED, Powered by Qualcomm APQ8055 Snapdragon S2 and running Microsoft Windows Phone 7.5 Mango, the device delivered smooth performance and multitasking capabilities. Its 8 MP, AF rear camera captured crisp photos and 720p@30fps video, while the Non-removable Li-Ion 1830 mAh battery (BP-6EW) ensured long-lasting usage.