Motorola DEFY XT XT556 official Pictures. Motorola DEFY XT XT556 is a Smartphone of motorola. The Motorola DEFY XT XT556 Android Smartphone. Announced Jul 2012. Features 3.7″ Display, 5 MP Primary Camera, 1650 MAh Battery, 512 MB RAM, Corning Gorilla Glass. Motorola DEFY XT XT556 price starts.