"...Twilio, the company that provides Signal with phone number verification services..."
Perhaps this is why Twilio (and Twilio-issued) VoIP numbers work so well for Signal when I don't want to use the number issued by my cellular carrier? Kinda hard to SIM-swap me if you don't know my real phone number.
I spin up a number and verify it can receive SMS (which it forwards to me via email). Since I need receive-only, this is fine. No need to futz with APIs or apps.
Perhaps this is why Twilio (and Twilio-issued) VoIP numbers work so well for Signal when I don't want to use the number issued by my cellular carrier? Kinda hard to SIM-swap me if you don't know my real phone number.