i'm sure that you have heard about xiaomi till now. after its latest price drop this phone has became very much popular in the market, as you cant get such a phone with these features that too at reasonable price,it is an ultimate phone . I am using it from three months now there's not even a single problem in this phone no heating problem.
The battery backup is also awesome. If you want to buy a phone phone below 15,000 then you must see this as an option . It's a single Sim phone. So I will definitely recommend you to buy this product.