Why is my iPhone 4s camera different quality to another iPhone 4s camera?

My mum has a iPhone 4s like me and her iphone camera seems better than mine by Quite abit. My camera is kinda grainy and I was wondering if it's anything in the settings that can change this? It's not majorly bad quality but it's definitely different to other 4s cameras!

The front camera has very poor resolution. The back one (main one) is much better. Try opening your photo direct in an image editng application.
If you shoot a lot indoors the phone will choose high ISO settings which are always grainy.

Hold both cameras side by side and take a photo of the same thing. Is there a difference? If so, check the lens of your camera. Still have the plastic on it? Smudgy?

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