Twilio is pretty great. I used it for https://github.com/Ell/catfacts and it was super easy to setup and get going. Had to take the site down due to lack of funds but processing SMS messages and sending them was a breeze.

https://github.com/Ell/catfacts/blob/master/catfacts/apps/fa... the twilio part of the project.

Using twilio, we implemented SMS package delivery confirmation (via UPS) and our customers love it.

So easy even my grandma could do it.

This is a feature that could be done with Twitter too, yes?