I hate to jump into this Smartphone Haters Club™

with the opposing viewpoint, but I find a smartphone indispensable.
The two long road trips I took this summer were the smoothest I've ever had, thanks to the various apps I used. TripAdvisor helped with my hotel bookings, and with finding good places to eat at. Google Nav (Maps) was on the head unit continuously, via Android Auto, showing the road ahead and more importantly, showing if traffic was jammed up, and offering alternate routes on the fly. I could also listen to turn-by-turn instructions in unfamiliar areas without having to watch anything but the road and the traffic. No paper map can come close to touching that. The weather information was only one tap away. Some places we visited had parking fees payable via app, so I took advantage of them. Nice to know how much time you have left, and add more if it's running low.
During lunch or rest area stops, I could flip through my daily news feed and check on the idiocy here and broad. In Vegas during the shooting, I briefly fired up Twitter for once, to see what that popping noise was outside our hotel room window, and then sent messages to friends and family who knew we were in Vegas to let them know we were safe in our room at the Trop.
GasBuddy helps me find the nearest and/or cheapest gas. Geocaching apps help when I pursue that activity. TrailLink helps me pick trails to ride when the bicycle is secured to the rack and ready to roll. Google Assistant helps when I need something answered quickly. Is the nearby state park open until dusk, or does it close at 6PM? Got the answer right there in seconds, thank you.
Work-wise, OneDrive gives me access to any document I need (my computers and devices all sync to OneDrive), and I carry the Office suite on my phone in case I need to view (or edit) Excel or Word files, and I can then email them, or print them via Cloud Print. I have shortcuts to all of the sites I manage (including instances of the "Monit" monitoring script, and the Pushover app that receives push notifications from the servers I control), and even have programs loaded to handle SFTP and SSH access remotely. (Only, I need a microscope to read the tiny font in the SSH terminal window.

) These are all things I need available in my line of work.
The UPS and FedEx apps keep tabs on incoming packages and alert me when they arrive. A few of the apps save me money at the stores. Another app lets me check the security camera back at home, and the Sensi app lets me turn on the A/C or heat I may have turned off when I left the house several hours prior. Did the car just throw an OBD-II error code? Plug in the OBD-II reader and fire up the app to see what's happening.
Media programs? Aside from Pandora and Tidal, I have Oppo's Media Control app, plus BubbleUPnP to access my music/video server. USB Audio Player Pro sends audio out via the USB port on the phone so I can send it to a DAC of my choice, complete with the ability to play high-res and DSD files if the DAC supports it. I can cast most sources to Chromecasts located around the house, and control them with the Google Home app if needed.
The camera is among the best out there, especially with its low light performance. I got photos on this last trip that put the DSLR to shame in some cases. The Snapseed photo editing app made touchups a cinch. And all photos are then backed up over WiFi to OneDrive and Google Photos, so I have two coipes of each. My only "weakness" to social media might be that I post to a private, personal Instagram account. And I find that one of the best ways to stay in touch with friends and family. Some of my sites do automatically broadcast to the major social media platforms, but I only handle those from a computer. (And it's usually only for maintenance and coding changes.)
Family usually reaches me by Hangouts, text, or phone. Clients get me by text, email or any other preferred messaging system. I hate talking on the phone, as I did it 40+ hours per week in my old line of work, so you will never find it glued to my ear. And fortunately, I am not needed that often where I need to make or take a phone call.
All that said, my data usage is very low. Using Project Fi, I am paying on average $25-$27 during my non-traveling months, and as high as $44 when I am on the road for maybe three weeks at a time. On average I'd say I am probably paying $30/month. I own the phones outright--I don't do contracts.
As for usage? Maybe it sounds like I am on it constantly, but I'm not. I'm usually the one telling others to put their phones away. I don't bury myself in social media, and have no desire to text anyone unless it's necessary. And other than searching for places to eat at or visit on the trip, it was usually one or two quick taps on a phone to access whatever I needed, then I was on my way. I don't need to bury my nose in the screen all day. The phone does it quickly, gives me what I need within a minute or so, and I move on. One need not be considered "addicted" to make efficient use of a smartphone.