Also, there are a bunch of photos that I can't delete for some reason. These are photos that were not taken with the built-in camera, but were downloaded from my Mac one time when it was synched. Any idea how to delete these?
I started
Delete photos...iPhone 4 with precisely the same question, albeit regarding a different model phone.
Doing it via the cloud as per joemikeb or completely wiping the phone are apparently
my only solutions.