It is necessary that the application goes into full screen mode only on the phones. I tried the only way.
ApplicationView view = ApplicationView.GetForCurrentView(); view.TryEnterFullScreenMode();
But, it is logical, so it will go into full screen and when running on a PC and on the phone. And to track the size of the screen on which the application is launched, as for me - it's crooked ... Maybe there is some easier way to indicate that the phones should have a full screen?