You simply talk to the smartphone. You hold down the home button to do so.
Either you ask the smartphone to tell you how to do it or you have the smartphone do it for you.
For example ask the smartphone how you make a phone call or how you get the news.
Better, get the smartphone to do it for you. Just ask the phone to call somebody or tell it to get the news. It will lead you through most processes.
No Windows needed, no Mac, not even a Chromebook.
(Don't want a smartphone? Try a cheap Kindle Fire.)
So, for most tasks forget the old way.
Welcome and learn the new way.
Note: Old stand-alone computers were magnets for trouble.
Note: Old stand-alone computers were magnets for trouble.
It is nowadays simpler amnd safer for Apple and Google to make a single systems or security change on internet cloud based systems for smartphones than for Microsoft to update millions of vulnerable Windows stand-alone devices.