No smart phone here. I've never had one. I can't stand them. I can't stand seeing people obsessed by them, being glued to them and missing out on everyday life, moments of quiet, daydreaming, being bored, reading books, thinking, looking out of the window, looking at nature, looking at people, being with people, being an actual human being. You can imagine how I feel seeing children with them. In restaurants, my god... Young couples sitting together in a restaurant, on a date, not talking, both staring into their phones - it makes my heart sink. My DS (9) knows all this and understands. No devices for him, he's a massive reader and would read books for 10 hours a day if he could. I've read to him out loud The Anxious Generation and he agrees that smart phones are horrible for children, he doesn't much like seeing adults buried in them either. If he wants one when he's 18, that'll be up to him, and he can pay for it himself.
I don't need one. I don't need to be constantly connected. I don't need to see my work emails at all times of the day and night. Don't get me started on social media either, which as far as I'm concerned is mis-named and utterly anti social. I have a laptop and am on that plenty of the time, I can do almost anything I need on it. Maps on a phone could be handy, but to be honest I like paper maps and A to Zs. Or just wandering sometimes and getting my bearings by looking. Sometime parking apps cause a bit of bother, but if there's no other option I'll usually just go somewhere else. Anyone who asks me to download an app or similar (NHS...) I just explain that I don't want to (and can't), and it's never been a problem. We went inter-railing around Europe last summer and it was completely fine, we printed out tickets, passes and information in advance (and had copies on my laptop too). I have a variety of different digital cameras that are way better than any on a smart phone.
I have a CAT S22 builder's-type phone with a very simple version of WhatsApp for group information and photos. I've never used the 3G/4G/5G and only connect at home when I have WiFi. I've told people that if they need me, I only check WhatsApp once every day or two, and if urgent please ring me. All works fine. I think I'm the last person I know who doesn't have a smart phone now (though I did briefly meet a person a few years ago who had a land line only and no mobile at all, which was impressive!). No problems at all and I wouldn't have it any other way. I don't feel like I'm missing out on anything, particularly, and I can't see that having a smart phone would be anything other than detrimental to my life.
[Note, I do like a simple life, so can see that this might not be to everyone's taste].