One month before I was buy this mobile phone and I am sharing my one month expreance about this mobile phone . oppo f1s is a very good looking smartphone and it is slim and design very well . this mobile is famous for its camera quality . its front camera is 16mp, its RAM 3gb, screen size 13.97cm, its rear camera 13 mp, and its battery capacity 3075mh. its contain 1.5ghz octa cores processor and it is run 5.1 lolipop operating system. oppo f1s sound is very good and this mobile is easy to use . guys I will suggest you to buy this mobile phone because its contain high power battery backup.