Lava introducing Z series with Z10 and Z25 in March 2017. New smartphone Lava Z25 is powered by Octa Core, 1.5 GHz with 4GB of RAM. The phone contains 32GB of internal storage that can be expanded up to 128GB via a micro SD card.The Z25 works 25%* faster* with the Mediatek Octa-core processor. Work and play with the 4GB RAM and 32GB ROM.