Samsung galaxy j7 is awesome phone. Its running on latest android platform that marshmallow. I tell about positive and negative point about phone
Positive point
camera quality is very good . primary camera 13mp and front 5 mp with dual flase
2 gb RAM so phone works very fast
battery back up very long lasting
16 GB Internal storage .expand with 256 gb
otg support
NEGATIVE POINT
Ringtone volume slow
some time heat problem
Overall that is good product you can trust it. I already have it so I guide that you also can buy if ???