Ten months after the launch of the Redmi 3S Prime, Xiaomi has launched its successor, the Redmi 4, in India. The differences between the Redmi 3S Prime and the Redmi 4 are mostly cosmetic. The new phone has slimmer, tapered edges and a cleaner, more contemporary design. The speaker has been moved from the back to the bottom of the phone and the metal and aluminum meet in cleaner anodized high-gloss aluminum lines. On the inside, the two phones are largely the same. There is the same 5.0-inch 720p LCD on the front, a 13 megapixel f2.0 camera on the back with PDAF, a 5 megapixel f2.2...
Source: http://www.gsmarena.com/xiaomi_launches_redmi_4_in_india-news-25047.php