camera roll "usage" number does not match photos in the app
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.