Samsung j7 is the the bad mobile in 2015
It does not have non removeable battery battery is to weak j7 mobile lag sometime And 1.5 gb ram is not enough in future 16 gb inbuild is not enough it should be 32gb atleast comparison with j7 other mobiles like e7 note 3 note 3 neo, etc are best mobile in the range
If you are planning to buy a mobile don’t buy j7 but instead if j7 buy e7 it does not lag or any other problems in it