camera roll "usage" number does not match photos in the app I have completely deleted all photos in all categories from my iPad 3 (16G iOS 7) but my settings continue to state that I still have 3.5G "used" (camera roll) in the Photos/camera app. I have no idea where/what these photos are and how to get rid of them. The  management tool in i tunes when sync'ed with my iPad gives the following data. Apps: 2.45G  Documents/data 1.25G  Other 5.05G  and 4.47G free.
Go to Settings > General > Date &amp; Time
Untoggle "Set Automatically"
Manually set the date a year or two in the past
Open "Photos"
Select "Albums"
If, like me, you had already cleared out everything from the Camera Roll and "Recently Deleted" folder, you'll smile to see that your "Recently Deleted" folder now has thousands of images back. Those are your phantom photos
Open it, "Select" and start deleting
Return to "Date &amp; Time" and fix your clock
Now, go back into Settings > General > Usage > Storage > Manage Storage. You'll notice your Photo &amp; Camera is empty if you deleted everything


Via the official Apple forums.