I know that this is a subject certain to get some of you reaching for your keyboards but ...don't panic, I agree with the old adage that you should only use a cellphone in an area considered private enough to take a dump!
On my Southbound hike, I will only be using my cellphone as a camera. I am planning to carry a camera-cellphone and send back photo's via email whenever I get a signal. I will send a 'text message' with each photo so that it forms a record for people to follow on my website. I have a solar panel on my backpack to re-charge the phone as I walk. This way, I don't need to carry a seperate camera and there is no chance of losing any pictures.
I will need to purchase a "Pay-As-You-Go" phone when I arrive in Bangor, Maine, so does anyone have any advice on networks & coverage etc.?