Hey! I am using the f1s mob this mob is very great good function good sound this phone is my best phone oppo f1s is very interesting mob I am buy a 6 month no problem and my phone perfect the phone battery backup really good hey gays you are buying phone oppo f1s is best phone Lisan 6month using phone no hang and good battery backup and camera is excelent and f1s is best phone and phone is very strong mob front camera good and back is good hey! Guys this phone really good this phone is my bessssssssstt phone