If I close an app will it use cellular data (iPhone)?

I want to save my cellular data and I was wondering, if I close an app (double click home button and flick it to close it) will it use any cellular data- I've turned background app refresh off

If you double click the home button and swipe it up, it won't use cellular anymore. But if I just close it and keep it open in the multitask window, it will.