title: phonenumber@vtext.com vs. Twilio, Clickatell, etc?
body: <p>I want to let users interact with my Django app via SMS. Twilio's pricing (for a phone number and the volume of texts I'd be processing) is okay, but why would I do this rather than go through carriers' email gateways? </p>
  
  <p>What do API gateways provide that @vtext.com, etc. addresses don't?</p>