Karbonn Smart A12 Star official Pictures. Karbonn Smart A12 Star is a Smartphone of karbonn. The Karbonn Smart A12 Star Android Smartphone. Announced Jul 2014. Features 4.0″ Display, 5 MP Primary Camera, 1400 MAh Battery, 4 GB Storage, 512 MB RAM. Karbonn Smart A12 Star price starts.