HT5043: Using the Unified Photo LibraryLearn about Using the Unified Photo Library
Currently Being ModeratedJul 16, 2013 4:11 AM (in response to gilbert187)
Photos in your camera roll can be deleted on your device: Select the photo>Tap the trash can, lower right.
Photos synced to your phone must be removed the same way they got there, through the iTunes sync process. You remove the checks next to the albums/folders, under the Photos tab, then hit Apply/Sync.