| There will always be more innovative styles & designs. People are trying to outsmart their competition. Ease of use, better quality - these are some of the factors that influence a customer, so manufacturers will always try to enhance them.
I guess the basic idea of having a camera on your cell phone is availability. You may not always have a camera with you, but your cell phone is there. So when something happens, you can just take out your phone and tada - instant photo and you can share it with all your buddies. | 
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