Hello. I have a iPhone 4 and recently when I was copying photos to our computer, I noticed it looked like there were some pictures missing because some of the file names associated with the pictures had gaps in between them. (IMG_101, IMG_103, etc.) It does not really look like anything significant is missing and I'm not one who deletes pictures much, so were they erased somehow or is it most likely I erased them myself and forgot about it? Thanks!