About a year ago I saw a fisheye lens that was built like this. I’d like a set of these, the camera in my Motorola V300 absolutely sucks and needs all the help it can get.
Instead of screwing them onto your lens, there is a magnet built-in and they will stick on to the lens (I’m having some doubt here). They don’t seem to be a joke at all: the telephoto lens offers up to 2X zoom power, the macro lens offers up to 4X zoom and the wide angle lens allow you to zoom out 0.5X. Each comes with a cellphone strap, when you are done using it, they turn into a charm!