How to delete a photo off my iPhone 4 forever?

So if I deleted a photo off my camera roll and photo stream. And then turned off photostream. Then I turned off iCloud
backup. And becuz I don't have a computer so will the photo be gone forever?

No.everything you put on the internet is there… At least you won't see it, but it'll be out there.

If you delete it from photos and photostream
Then back it up it will never come back on there