My iPhone 4 camera is fuzzy how do you fix it?

It's only my back not the front

I presume the iPhone 4 has a 5 mp camera? Check out if your camera setting is on 5mp. This could just be because it is currently set on VGA, 1.3 mp, 2 mp or 3.2 mp, which is why the quality isn't good. Never had an iPhone myself, but definitely worth checking the resolution setting of your camera.