Get a prepaid with an eSIM with AT&T/Rogers (or any of their MVNO’s) for maximum compatibility; cheapest the better. You need an eSIM compatible phone. You can verify this through the carrier’s site from your phone.

Only need the IMEI and Account number essentially

Port the number to voip.ms

Do whatever you want with that number for like pennies a year.

VoIP.ms has an SMS app for android that I know of

A way around that is to port a prepaid number to a voip service. I’ve kept old numbers that way when moving