Phone recommendations

I'm looking for a recommendation for a phone, preferably a cheap used phone since I'm not really looking to break the bank and drive a Linux phone as my main until I can do so confidently without major disruption for work purposes. So SMS and phone calls are a must.

Things I'd like to have:

1. 5G radio in case I use it long enough to where LTE towers get rolled further back before upgrading
2. External monitor capable for an android auto replacement
3. I really don't care which distro I use, but one with a large app repo would be nice.
4. A Signal chat client
5. VoLTE supported would be nice, but not necessary