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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