When I do discuss these experiences, most people aren't able to believe me. "How?" is a typical response... which to me seems equally strange a question.
It does make parking difficult ("pay with the app!"); last time I had a court action, the judge required me to sign a document stating I did not use email, because this is "a required piece of information."
Until this year, I handed out my numeric pager as "my phone number," which grateful reduced successful contact [to my chagrin].
But I've learned that, aside from mentioning "I don't have a phone" it's really not useful to discuss it any further on the internet. There seems to be a large cohort of trolls who love arguing with anybody who doesn't have a phone. I guess it bothers them that some of us can be free from what so many are addicted to.
Technically it is pretty much like a phone but it is not used as a phone. No number, no sim card.
I am pretty sure some of these apps could work on waydroid too if needed.
So in the end all this discussion really depends if we are talking about the mobile device as a whole that you carry with you nearly all the time or some parts of the ecosystem that you may have at home.
I remember my dad worked at a bank in the 90s and had one shaped like this to enter one of the buildings: https://www.amazon.com/HyperOTP-Time-Based-6-Digit-Services-...
But if you don't have a phone to program it you'd need a camera or some way to manually enter the data.