I love the idea of this plugin and I'm using it in conjunction with Gravity forms to publish a custom post type for another plugin. The form fills out all of the custom meta boxes upon submission.
When I normally publish these posts they make a call to Twilio's API, however, when I use the form, Twilio's API isn't called until I manually hit Update.
More info on Twilio's API for sending SMS: http://www.twilio.com/docs/api/rest/sending-sms#post
Please bear with me as I'm not a programmer, just learning.