I also use SMS for transactional SMS, and my understanding from their docs was also they don't, from this page: https://support.twilio.com/hc/en-us/articles/223

I also use SMS for transactional SMS, and my understanding from their docs was also they don't, from this page: https://support.twilio.com/hc/en-us/articles/223133807-What-is-P2P-and-A2P-messaging- https://support.twilio.com/hc/en-us/articles/223133807-What-... > All Twilio messaging is considered A2P in the US and Canada.