I buy the the oppo f1s camera phone before 7 months. As I used and noticed the camera quality is superb front camera is execellent. Battery backup is good but not through out the full day it is about 9 to 11 hours.the phone has heating problem during high quality games. It is also have slow charging problem.it is 4 gb ram and 64 RoM which is execllent. Excepet 1, 2 problem the phone is overall good.