I bought this phone from Flipkart last month & here is my experience with the phone.
The Xiaomi Redmi 3S proved to be quite an ideal smartphone for anyone looking for a compact smartphone that is affordable but doesn’t cut corners in a big way. Right from performance on browsing, social media apps to gaming, the phone never felt slow. The battery performance really stands out, with almost 2 days of battery life for moderate users, you really can’t ask for more from a smartphone in this price range. The device feels well made in terms of build quality and easy to use. On the software side, Xiaomi’s MIUI on top of Android Marshmallow makes for a good combination in terms of customization and unique features that MIUI brings to the table.
The camera is the only area where we expected more from Xiaomi. It clicks great pictures in daylight but isn’t able to hold-on to the picture quality at night. One more thing you will not get headphones with this phone.
So I will recommend you this phone if you want more features but your budget is low.