If you want to buy a new mobile phone then first of all you should know that what is your need and budget then accordingly decide which phone could be best for you.I recently buyed a redmi 4 as I know my requirement and at that price this is the best phone in India.
Step 1: Upto how much budget you want to buy a phone
Step 2: Now we should know that what were my requirements like size of display, camera resolution, memory of the phone including ram and storage, camera requirement , etc
Step 3: After deciding the requirement decide wheather to buy online or offline.
Step 4 : Let I want buy it online, I will search in all the well known sites.
Step 5 : Choosong the phone that I want to buy.
Step 6 : Compare the prices of all the sites and grab the best deal.
Step 7 : While booking if possible make the payment through cash on delivery.