I useing this mobile .it is the good perfromance and long lasting phone.The lenovo Zuk Z1 is the best mobile phone on 2016 . This item comes with 3GB Ram and 64 GB Rom .this phone is good performance and better beattery life .this phone paltfrom is android 5.1 ( lolipop) and planned upgared 6.0 ( Marshmellow) . Cpu is Quad-core 2.5 GHz karit 400 and ciphest is Qualcomm MSM89474AC Snapderagon 801.this phone is good performance on 3D gameing .this phone GPU is Adreno 330. Lenovo Zuk z1 good for camera quality , front cammera 8MP and Rear cammera 13 MP , auto focus , OIS , dual Led flash.The Display size 5.5 and 1080* 1920 pixels ( 410~ ppi)