I am using the redmi 3 s prime first of all I am going to tell about phones battery back up because 1st thing every person need in mobile phone is its battery back up and the battery back up the redmi 3s prime is everlast it works 2 days even when you use internet in it listening songs calling anything u do is best in it in low cost you get fingerprint sensor and the company itself reliable and dual sim with inter mamory more so u no need the mamory card