Is there an "open" phone that's perhaps based on the non-Google Android? What's your experience with your carrier? What are the pros and cons of your system?
Note: Verizon just informed me that my admittedly old phone will quit working when they shut down 4G LTE by EoY 2022. Clearly I'm not using applications that tax the phone's processor or memory capabilities.
The major American carriers are shutting down 3G. But for that to be a problem you’ve got to go back to the iPhone 5s, which has LTE data, but not for voice (going off the top of my head there, might be a generation off).
[1]: https://e.foundation/leaving-apple-google-e-os-is-available-...
EDIT: Also, Verizon has no plans whatsoever to shut down their LTE network.