Which Android Function/Feature is Invaluable for Your Routine?

Our routine dictates the way we use our smartphone, as it should. Often, our smartphones also dictate our routine. Nonetheless, there are plenty of ways in which our phone makes our everyday life easier.

We ask you, what is that one everyday function that makes your phone invaluable to your routine? Which service, app, or even hardware feature is crucial for your typical day, be it in school, at work, or goofing around?