I did it. I spent a whole day without turning on my phone. Last Saturday, while on our church men's retreat, I left my phone in my tent all day long, and never even turned it on. There were a few moments when I reached for it to take a picture, but managed to survive without it. I did have my camera available, so I could still take a few photos.
I can't remember the last time I went all day with no phone. I need to make a regular practice of it. It gives me a sense of freedom. It's hard to believe that only a few years ago I had no smart phone. Life was slower and simpler then.