This is what you need. Please check the supplies tab.

Make sure your camera case comes with a 37mm lens mount to attach the lens.

Insert you iPhone into the camera case.

Here's a picture taken with the iPhone4 without any conversion lens attached.

Now attach the wide-angle lens.

Picture taken with the iPhone4 with wide-angle lens.

Attach a tele conversion lens.

Picture taken with the iPhone4 with the tele conversion lens.

Attach a fisheye lens.

Picture taken with the iPhone4 with fisheye lens.

Now enjoy taking awesome photos with your iPhone with a proper conversion lenses!!