The Androids I've seen all have status bars, so any app running will be rendered underneath it. The iPhones I've seen all do NOT have status bars, so the content of any app running is rendered behind the time, battery life, etc.
Is this the case for all Androids and iPhones?
Android apps have an app bar at the top, whose visibility can be controlled through the parent theme that is applied to the application to be either VISIBLE or GONE. You can control its visibility on each layout, based on your needs.
Similar concept is present in iOS, where we have a safeArea, where a View can inflate without worrying about what content will go in the upper left and right nodges.