Ahh sorry I forgot I'm using the Twilio ekata_reverse_phone addon that you can get in twilio marketplace so I have carrier info in the lookup response.
I guess then whether it is 100% on Twilio being the carrier is a little less likely but I tested a few more twilio numbers I know and they all returned with Twilio as carrier.
Some of the political texts I get show twilio as carrier. Calls tend to be Onvoy which is now Inteliquent I believe.
Will also show who the carrier is believed to be if not them.
https://www.twilio.com/docs/lookup/tutorials/carrier-and-cal...