Hi friends today iam going to tell you one of the worst smartphone a37f launch oppo iam using past 6month but phone does not have good performance like battery, low ram 1gb always hanging problem if I install 2ormore app I will process late and not responce quickly we have to clean always ram memory and it will take time to free from hanging and very very very worst battery packup always in charging wholeday.but one thing is there camera is good and sound also good so please friends dont buy such phones like 1gb ram or 8, 16 internel memory I hope this review is useful to buy good smartphone in market tension free