How to stop iPhone 4's blurring the image when zooming on camera?

Is there any way to stop iPhone 4's blurring the image when zooming on camera?

It's not the iphone. The nut holding it isn't steady.

Http://keerok-photography.blogspot.com/2011/12/blurred-shots.html

When you zoom in the the iPhone all you're doing is making the image larger which will make it more pixely/blurry. With the iPhone I recommend treating it as a prime lens. Just use your body to zoom and you'll have a sharper shot.