I have a Samsung j3 purchase this from italy in february.Single sim 4g device.It s battery backup medium good not a better 2600 mah battery. 1.5gb ram 8gb is internal storage not a good many applications install then show low storage message create this is very bad for samsung j32016.But its ram good performance.Never hang it s operating system updated only lolipop 5.1 not a marshmallow updated in future.Ghis is very bad operating system sucks.