Hi friends, I brought this mobile when it is in kitkat version but when I had upgraded it to lollipop it hangs for no matter it will struck all the time and it wont let me to lift the calls and to dail the calls when I am trying to make a call it will automatically gets switched off. it is making me a great burdon. so better donot upgrade it.hope dont buy a yureka mobile wit lollipop version. some what better to use in kitkat version. again it is big deal to get downgraded into kitkat again.