Wildlife photography is an area where a good camera and an excellent lens is always going to be paramount and a mobile phone is never going to cut it. Sport photography is another area, although I have known of some sport photographers using phones in certain situations, partly because of their superior upload capabilities.
However these are relatively niche and edge uses, and not really applicable to most peoples general experience of photography.
One professional area where phones are more likely to be used is in street photography, because people are less disturbed by them and you stand out less.
Biting the hand that feeds IT
