Is Wi-Fi Assist Using Up You Data Allowance on your iPhone and iPad

Wi-fi assist is meant to cleverly give you a better internet connection if your wi-fi signal is not that good. It will revert to using your mobile or cellular data. The problem is you may think you have been using your wifi but it has switched using up valuable data. The icon at the top does change but it could be subtle.

If you want to make sure that it does not use up this data then here is what you need to do.