Geeky shutterbugs have fun finding ways to improve the iPhone's built-in camera. Whether it's going Macgyver to add a macro lens or actually opening the case to mod the iPhone for close-up photography, iPhone photogs have long sought to improve their cell phone photos.
iPhone camera lenses
iPhone and iPad apps tagged "iPhone camera lenses."
Mobile Phone Telescope is a Neat, if Low-Res, Addition to the iPhone
The Mobile Phone Telescope is a nice add-on to the iPhone and the first of its kind that I've seen.
The equipment consists of two pieces - a clear plastic cover for one side of the phone, and another clear plastic cover connected to a basic telescope for the other side.