Karbonn A27 Retina official Pictures. Karbonn A27 Retina is a Smartphone of karbonn. The Karbonn A27 Retina Android Smartphone. Announced Mar 2013. Features 4.3″ Display, 8 MP Primary Camera, 2 MP Front Camera, 1800 MAh Battery, 4 GB Storage, 512 MB RAM. Karbonn A27 Retina price starts.