The mobile oppo A 57Some problems was faced my friend .I think some models of oppo are getting heated up and my friend is the one who is having that problem heating and his mobile battery is left for few hours, even if dont use mobile, some time it left half off battery .It is an issue which can oppo must take care auout this battery problem .Using continuously the gets heatig was one problem .Except these , the remInig camera , ram, sound are good