If you are thinking to buy a phone then first of all check its review and rating at mouthshut.com because this site gives you genuine suggestion with help of review and ratings.
Another thing that you should check it specifications that what features it has that another phone does not have at your price range phones. Another thing that I want tell you that most of people buys or thinks to buy great feature phone at very small price range. People only knows about RAM, Internal storage, Camera Quality but does not know about its cheap set, processor, display quality type. So they thinks this phone has many features like lot of ram capacity, much storage and it also has camera with much Mega Pixels at low price range. And they buy it after that they got their phones are heating. hanging, Camera has more pixels but not giving that quality. So I suggest that not only watch phone Ram.Storage, Camera Pixels, screen size but also look at its chip set because every phone has its chip set quality, Just look at which camera is used in the phone like most of samsung mobiles uses sony cameras. Look also at which processor is used and which screen display is used like amoled display.
Most important thing that I have told above first check reviews about the phone that you want to buy. It will help you to smart purchage.