As many have I accidentally deleted the wrong photo a few minutes after taking it (with no backups). Maybe iOS has a "trash bin" in that it only actually deletes the file when it needs space. This would mean that the file would exist on the phone but not appear to the user. Could this presumption be as probable as it seems? Speaking of that, a phone in 2014 should have a way to restore accidentally deleted files if they're deleted right after their creation.