I love technology and usually have the lastest cellphone out there. The older sony w810i was a solid cellphone. Built very tough and had a pretty decent camera for 2mp. It wasn't even a cybershot line of cellphone, it was a walkman. The sony cybershots are good, especially the k790 it is a 3.2mp, this model is a bit older so you can usually get it for a cheaper price. The 5mp cybershot sony k850 shots amazing pictures but has softwares issues so I would avoid them.
Samsung and Nokia also have some very good camera phones out there. Try checking out the U series or G series samsung cellphones and the Nokia N95. I wouldn't get an iphone for the camera feature when fishing because it's not a rugged device you would like to carry around and they don't have a flash. My daily phone is a blackberry curve 8320 which is a 2mp that takes decent pictures. I also have a razr as my beater phone when I am creek fishing.