Plum Sync 4.0b official Pictures. Plum Sync 4.0b is a Smartphone of plum. The Plum Sync 4.0b Android Smartphone. Announced Jun 2015. Features 4.0″ Display, MT6572 Chipset, 1.3 MP Primary Camera, 1.3 MP Front Camera, 1300 MAh Battery, 512 MB Storage, 256 MB RAM. Plum Sync 4.0b price starts.