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Use a laser pointer to create a macro lens
By dissecting an old laser pointer and removing the focusing lens from within, you can attach this in front of your smartphone camera's lens using little more than some duct tape and a hairpin. Try zooming in now -- and enjoy your makeshift macro lens.
HELMUT Film Scanner
The Helmut film scanner, available on Android, transforms your phone into a photographic film scanner. When you capture images through the camera or alternatively store them in a gallery after shooting them with a DSLR, save the frame using the Helmut application. Crop, tweak, and use a number of color balance tools after the scan to digitize your old negatives.
Water drops that create a macro lens
One of the oldest tricks in the book, but still a valuable tip -- and free to implement. An alternative way to create a macro lens on your smartphone camera is simple enough -- place a drop of water on the lens and flip the camera over quickly so it does not spill, then have fun.