Celkon A21 official Pictures. Celkon A21 is a Smartphone of celkon. The Celkon A21 Android Smartphone. Announced 2014. Features 4.0″ Display, MT6582 Chipset, 3.15 MP Primary Camera, 1.3 MP Front Camera, 1500 MAh Battery, 512 MB Storage, 256 MB RAM. Celkon A21 price starts.