It is my personal experience I have used this phone and let me tell you that I have love this phone very much.
It is very nice phone under the budget having all the features which a android phone should have.
Its camera is also good and sound quality is excellent.
Its display is also good.
And not only it has all these fetures but all is 4g .
Many phone starts hanging or laging when it becomes old but I am using this phone from 6 moths but there is not a single problem has occured til now.
It is as it was when it was new it is very light weight and off perfecr size to carry in your pockets.
I am very happy that I bought this phone and I am fully satisfied that my money was not wasted.
If anayone is thinking of buying a new andorid phone under the budget I would sugest them that they should buy redmi 4a according to my personal experience.