My wife and I got rid of our land line not long after the turn of the century. And now, because we travel a LOT, the map function on those phones is extremely valuable to us. They even work in the Bahamas.
And before I retired I used it for my commute. It allowed me to avoid bad backups on numerous occasions.
There are a ton of other advantages too, but I could go on for hours about how useful smart phones are.
But I don’t do social media.
I use the camera more than I thought. Taking something apart, it helps to put it back together. It helps me document what still needs to be done on projects at a different location from my shop. Taking a picture of something before I go to the store for parts. I even use it to take pictures of nuts and screws in difficult locations.
Yes...GPS is a Godsend to me. I can get lost anywhere but GPS rules the day for me!
I love audiobooks. When smartphones develop the capability of handling audiobooks, I started keeping several novels and my phone so I can listen over the car radio while driving around. I love it.