I have also used Samsung galaxy j7 recently 1 month ago.in this smartphone the memory is 2GB Ram! . and 16GB ROM Expendable upto 128GB.! With cool 5.5 inch HD display.
Did know that the battery level of this phone is 3300 mAh Li-lon battery with an 13MP primary camera and the front camera is 5 MP and this phone has a problems also.! And that is when we put to the Charing the phone warm and gonnna heat very early! and when we install more aaps, the will be have a hanging problem., I have not satisfied from this phone and the speed of this phone.!