I did it for 3 months. I really enjoyed my time doing it and learned a lot about my usage. It was a cheap $50 experiment. After I went back to my smartphone, I uninstalled ALL social media apps. Turned off ALL notifications but left calls and messages as an exception. My smartphone is now essentially a feature phone. It's not 100% the same since the big screen does lure you in to use it but my usage is still way down and because I don't have any social media there's no reason for me to be on my phone around other people. I wholeheartedly recommend trying it for those curious.
That reminded me how a local wanna-be influencer did a smartphone detox for a week, immediately after the completion she posted an FB story: Part 1 - Reflection, how eyeopening the experience was, how much time she suddenly had for the things that truly matter etc. Subscribe to not miss the Part 2!
Eh, I don't like the idea of getting rid of my smart phone. But I did get rid of all the shit I didnt actually like. I use my phone for Music, maps, the camera, messaging a few people, and a few other things. I got rid of all the crap social media, Facebook, Twitter, Instagram, even reddit(and have not put a lemmy/kbin app on there to replace it), there is not shit mobile games installed. Just does what I need it to do, and doesnt constantly bug me about Person X and what they had for lunch.
However, if I ditched the smart phone, I would need a phone still, but then I still need the MP3 player, a camera. And I would much rather have 1 bit of kit that does all that well, than 3 items.