I have found smartwatches a good for this purposes. With cellular connectivity you have emergency services, calls, certain notifications, maps, and NFC payments. You cant procrastinate on it as easily as with a phone.

Many in this thread suggest a feature phone. Anecdotally, a friend of mine went this route, but people became suspicious of him. Especially when meeting new people. His dates thought he was cheating on his (non-existent) wife, or that he was hiding something in more general sense. He returned to having a smartphone after a year or so with a feature phone.