I’m using this phone since one and half year. I faced no problems. It’s the best in 820 series. It got 2gb RAM. 1.7GHz Octacore processos. 5.5 inchs display. It’s good to use for watching movies ans best for gaming. Nearly 6 to 7 times it fell off on the ground, but still it’s working nicely. So I can say it’s a very rough useable mobile. Front camera is of 8mp and rare camera is of 13 mp. Smile detection, gesture sensor is installed in this phone. Overall it’s a great phone to use it