[joveian]

Not sure if you will still check this thread but in case you do:

I only have a voip.ms account at this point (I use linphone, that I'm not entirely happy with but seems better than the alternatives I've been able to find and is cross platform). I only connect to it when I need to make a call and get voice messages sent to my email. While it might be different depending on where you live (I'm in a large city in the US), there are a number of places that expect you to have a phone and it will be more effort to be completely without one, so I'd recommend some VOIP account if you are going for the least annoyance non-smartphone option. Some companies require the ability to send you a text message, including Google (I think, unless there is some way to get around it) and Paypal. I was able to get SMS from Google on voip.ms but not from Paypal (they say SMS from short codes usually doesn't work and it they have no idea when they might be able to make it work). Paypal still lets me use the account (and stopped the annoying messages on login after I enabled TOTP) but I can't add any new info (update cards or bank info) so it may eventually stop working. My bank also seems to require that I have a phone but I can get the text via voice (but not just a message, you need to type a number before it gives you the code), text, or authy. I should try to see if they would give me a TOTP key if I contact them. You will need some phone number to enter into a form much more often but for me I think those are the only ones where I have actually needed to use the phone.

At least in the US, old cell phones can be used for emergency calls as long as they can connect (even if they do not have active service).