Comment by toast0

> Additionally, Twilio does not purchase short codes (ie 12345) which means its harder for the carriers to track bad behavior across their network. There is an initial cost (fairly high) to acquiring a short code, though you can also share short codes across customers in some cases. Acquiring a single short code and sending all messages from that short code would likely reduce costs.

Twilio offers short codes, but short codes are country specific, and the costs for sending to the US are low anyway < ~ $0.01/message for most services, lower with volume; IIRC, short code messaging costs were half, but then you've got some overseas destinations where it's $0.10/message and that's real money.