Wiko Rainbow 4G official Pictures. Wiko Rainbow 4G is a Smartphone of wiko. The Wiko Rainbow 4G Android Smartphone. Announced Sep 2014. Features 5.0″ Display, MT6582 Chipset, 8 MP Primary Camera, 2 MP Front Camera, 2500 MAh Battery, 8 GB Storage, 1000 MB RAM. Wiko Rainbow 4G price starts.