Hello friends my name is viki.i have use this mobile last 14 months and I share my experience.this mobiles main problem is battery draining problem when I sleep it 62% after morning is 0% it is a very big problem.and is android version is 5.1.1 it is very old version that I am not enjoyed.oppo mobile are very dangerous because its very heating and blast.its loudspeakers is very unusable.