In the web world, their is lot of website for selling mobile phone . But peoples are confuse which one is good .
I pesonally experience, Amazon, Flipkart both webisite is enough for choosing phone .
First you check what is your budget, but freind if you purchase more than 10000 INR price mobile phone its good for you.
You can check mobile configuration like Ram & Processer . But If Ram is above 2 GB, that is excellent .you choose any processer, its depend on your need,
In the market there is 2 types phone . First is Apple IOS & second is Android .
In IOS, there is single company only Apple, But if you choose Android phone, ONE PLUS is better choice .