The worst model z5 premium. one of my friend is using the model I pic his mobile for a couple of days to capture my weekend pics with my family vacation that I went. I face a lot of problems with tbe model it gets laggs all the time and the mobile heats like a hell. I never seen it before like this and battery is last only for 7 to 8 hours its soo worst that to spend a lot of money on this model. after that it returns the mobile to my friend he also told mee all the problems what my friend has face it.