[init-as]

Isn't this kind of something that might be phased out in the next few years. I'd imagine there would be some kind of web tool doing authentication like this at some point just because of how obsolete sms seems these days. Correct me if I am wrong though.

[stanleydrew]

The products offered are not simply for SMS-based authentication. That is merely one use-case out of many that you can build on a platform like MessageBird or Twilio.