Lenovo vibe k4 is the best mobile in k series. Earlier I was used k3 now I M using k4 .Best battery backup .
Never Hanging problem.Best camera quality.Good charging Speed.I am using white colour is looking very sexy .thin light weight.The picture quality is so good.
It is price to value mobile in this amount.Charging so fast .due to 5.2 v charger . Sound quality of this mobile is very good.So I M very happy with this mobile in this cost of amount.I suggest all of u to buy lenevo k series .