Note that on the Android platform, Xamarin.Forms.INavigation operations do not generate activity lifecycle notifications. For each Xamarin.Forms.Page that you push or pop, the Android implementation of Xamarin.Forms.NavigationPage simply adds or removes the content of the page to or from a single activity.

Also note that the Windows Phone platform provides navigation natively. Therefore, you do not need to use a Xamarin.Forms.NavigationPage object to get navigation on that platform.