Samsung b7722 star duos is most worsed phone . according to features its cost is to much higher . its sound quality is fine but does’nt like its look its cost is near about. this phone is become to much older.This phone has been lauch in 2011 at that time it is good to buy because at that time there few mobile phones available like this. nowdays people require mobile which have huge features . this phone has low ram and processing speed is also low . picture quality is fine . I suggest you that dont buy this phone