Hi scareorrizer ,
For the SMS to work, you will need to have an app set on your device that can use SMS.
Mobile devices have a messaging app on default but for Windows or Mac, you need an app like Skype to be able to send SMS.
If you used a mobile device to test this and it didn't worked, could you perhaps let us know which phone you used?
We would like to test and see if we are able to find what's causing the issue.