The NY Times has a piece on Shawn Rocco and his cellphone photography.
Some years ago I did some work with a famous fashion photographer. He knew I wasn't part of the industry and showed me his "book" of important photos he had taken. One was a cover from Vogue that was taken with a $10 Kodak Instamatic in the 70s - it seems he was on location in Tahiti and the trunks containing his gear hadn't arrived. The models were there and the clock was ticking - he went to the hotel store and bought a half dozen cheap cameras and started shooting. The image that was finally selected was incredible.