As, my uncle is using this phone I can tell you about the major problems which can occured qith you also.
1: Vibration motor is sometimes un-operative.
2: Battery drains very fast.
3.Auto rotate sometime doesnt work.
4: Charging is very slow.
5: Overheating.
6: Bluetooth issue and wifi connectivity problem.
I think this review will help people to choice the smart.Anyways now itz upon you wanna buy or not