Samsung has designed very best mobile that is galaxy j7 prime it has 5.5 inch screen with full hd display with 3gb ram.it also have a long lasting battery 3300 mah, comig to camera it has 13mp rare camera and 8mp front facing camera captures beautiful and detailed images in day light. it comes with dual sim option as micro sim.the android version is marshmallow 6.o.o, it can expandable upto 256 gb external microsd card.it comes with a octa core processor, it allows 4g, 3g, 2g.it has an audio jack with 3.5mm.it has a removal battery.it also comes with extra feauters like s bike mode, s power planning etc., it is the best mobile in my opinion.