The iPhone has a fixed lens, you cannot zoom or get really close. While on vacation I thought it would be interesting to try the Olloclip lenses with my iPhone. I have the 4-in-1 and the telephoto / circular polarizer.
These lenses clip onto the iPhone 5 or 5s to give you different views. I have mostly been playing with the 4-in-1 as a macro lens so far.
This is a lot of fun but as with any macro lens any movement makes it hard. So using a Joby tripod really helps. I mount the iphone in the glif adjustable mount. A remote release is a great idea. You can use the volume up button or your Apple ear-buds or other device.