How long can you go without your smartphone? As in, leave the house without it and not need it? I've been trying little experiments like going for an hour-long walk, or going to the pool, and not bringing my iPhone with me. I don't recommend it for people who are somebody else's emergency contact, or if you need it to live.
For context, I'm a late-forties white male who lives in the middle of a large North American city that's extremely safe. I think I'd need it if I want ride on the local bikeshare, because I can't find the card for it, and that may not even work anymore. Maybe I only need a credit card? I'd miss playing music or listening to a podcast or audiobook on longer walks.