I've noticed that cellular data turns itself on after i turned off every time. Like i just turned them off go back to setting page and then go back to cellular and all cellular data apps are on

This was a problem for me recently, as well. Alas, after a few long phone calls to Apple, visits to the Genius Bar and restores galore, the problem was not solved.

The only solution I found was to do a factory reset. Don't restore from your iCloud or iTunes backup: whatever was causing the problem for me was reinstated each time from both iCloud and iTunes backups

If you try this, and use iCloud to backup important media or data (pictures, etc), I recommend that you first back up this material by some other method, so that you don't lose anything important!

Hope that helps...