Why won't my iPhone 4 camera focus?

Every time I go to take a photo of my nails on my phone the camera is really blurry and won't focus. The camera is not dirty and it used to work perfectly fine before. The front camera works fine how it did before its just the back camera that's playing up.

How can I get my back camera to work again?

It's because the iPhone doesn't have the close focus point your looking for, it's made for quick snap shots.

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