You would be better off hosting your “phone number “at Twilio and then forwarding that number to a throwaway SIM card that nobody knows the number to.

Your “phone number “that people interact with cannot be hijacked with SS7 because it’s not a real number… you’re immune to sim swaps … And you can Jettison your physical phone and SIM card at any time with no penalty.

As a bonus, because your actual phone number is now programmable you can do interesting things like set up a SMS firewall. You can, for instance, collapse all incoming text messages to ascii-256. Or truncate their overall length. Or CC your incoming SMS to a dedicated mailbox.

I have operated like this since 2016. I have no idea what my physical SIM phone number is and neither does anybody else.