Cell phone cameras have gotten ridiculously good ridiculously fast, but there's still some shots that are hard to capture with a camera phone. Like macro photos. But if you're itching to get a close-up shot and only have your phone handy, try this tip using only a drop of water.
Using an eyedropper, toothpick, or some similar tool, drip a small bead of water right onto the lens of your iPhone. Tension should keep the bead in place, and the water acts like a magnifying glass, giving you a close-up view of your subject.
Website Tested, from the Mythbusters guys Jamie & Adam, put this easy tip through the ringer and found that you really can get great, in-focus close-up shots with your cell phone camera:
Chekc out the tutorial on Tested for some tips on getting this technique right—like how you need to flip your phone over quickly to keep the bead of water from sliding off the lens ring.
Oh, and if you're worried about damage, since water and electronics don't usually mix, you can relax. The iPhone's water sensor isn't anywhere near the camera lens, and short contant like this isn't likely to do any harm.