I've Galaxy S9 on Bell canada. I've noticed that mobile data quick toggle from quick notification drop down panel is missing. I've been using "data usage manager" edge panel to turn on and off mobile data. But recent update to One UI made it disappear too. However, It is available and selected in edge panel settings menu, but does not appear when swipe from edge of the screen (Note : "data usage manager panel" has disappeared not the edge panel itself.) It seems like Users have been forced to use more data.