I find modern smartphones more and more unusable, both OS becoming more hostile towards the user, and applications widely moving to dropping logins in regular intervals. That has been happening for years already, so I slowly moved more and more stuff back to a computer.
By now I'm at a point where I no longer even backup my phone - there are a bunch of apps, but I can just install them and log in again on a different device as needed.
The final step to make it truly throwaway was me doing a custom matrix bridge for SMS earlier this year - I had voice routing setup for a while already. So now my old SIM cards are in a 4G modem at home, and the phone I carry around with me just has a data SIM. Huge quality of life improvement, as I can terminate as many numbers as I want there, and have access to both voice and SMS data from my computer as well.