Lava Z91 (2GB) official Pictures. Lava Z91 (2GB) is a Smartphone of lava. The Lava Z91 (2GB) Android Smartphone. Announced Jul 2018. Features 5.7″ Display MT6739 Chipset 13 MP Primary Camera 8 MP Front Camera 3000 MAh Battery 16 GB Storage 2 GB RAM. Lava Z91 (2GB) price starts.