The protective plastic you already removed is all there is. It has nothing to do with quality images. There are two main factors that are likely to be the cause of poor images from your phone camera:
1) The camera is likely to select a relatively slow shutter speed, which means that any movement of the phone or whatever you're taking a picture of can cause motion blur in your picture. You need a lot of light to get the camera to use a faster shutter speed. One way to do this is to force the flash to fire, if you're close enough to the subject for the flash to illuminate it. Another way to get a faster shutter speed is to use the Sports shooting mode. Finally, you can manually increase the ISO to get a faster shutter speed. The faster the shutter speed, the more likely you'll get a sharp picture. Also, be careful to hold the phone as steadily as you can when taking a picture; if possible, rest it on a stable surface to make sure it doesn't move.
2) The camera is using a high ISO that it's selecting automatically because the scene is not brightly lit. A high ISO will mean a noisy, grainy picture.
Also, are you making sure the camera is focused on the subject of your picture before you press the shutter button? Make sure it shows a green square on the subject before taking the picture; you can focus by tapping the screen where you want the camera to focus.
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