dear member , please perform settings as following 》》 click connection settings, go to data usage ,then mobile data usage ,search the apps for which you can restrict background usage ,click on it and disable data usage in background.
Apps that run in the background run when you're not using them; when you're using an app, it runs in the foreground. Restricting background data on an app prevents it from using cell data in the background or when you're not using it. These apps can still use data in the foreground or when you're using them.it doesn't mean if you restrict it then data show 0.0
