What's the deference between this camera and an iPhone camera?

http://www.flipkart.com/nikon-d3200-body-af-s-dx-nikkor-18-55mm-f-3-5-5-6g-vr-ii-lens-dslr-camera/p/itmdyz8hpwfdydv2?pid=CAMDA6RJERF8HS4G&&lens_attachmentSelected=true&otracker=pp_camera_lens_attachment

I'm not a pro-photographer, just a "wannabe". If I get this camera, apart from the "style" factor, will it take noticeably better pictures than my iPhone camera? What exactly is the difference? I've heard the "megapixel count" doesn't matter unless you're going to enlarge photos to poster size.
Added (1). If this does take noticeably better pictures, I'd order it right away, please help.
Also, if you recommend this over the iPhone camera for everyday hobby photography, let me know which "lens attachment" shall I choose. There are so many choices, and I don't have any idea.

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How well would a 28-70mm f/2.8 work on a nikon d750 full frame camera?

How well would a 28-70mm f/2.8 work on a nikon d750 full frame camera?

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Use power cord to transfer photo?

I have a Nikon P530 camera. However my computer don't have a HDMI port. The camera could be recognised if I connected it with the computer using the charging cord provided and I could transfer the data from the camera to my computer. But this time it is not being recognised. Pl. Help.

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