To use handoff, you simply double press the home button to show both your open apps, as well as have a hand off grabber appear at the bottom if you wish to continue working from your MacBook to your iPhone for example. This is all fine and well until you don't have any apps open as iOS 11 doesn't let yo access this view without an open app. I need to open an app, close it, double press to get to this view to then get to the handoff app.