Ihad thesame question, but the answer from support was that it needs to be altered in sql...
not really a satisfactory answer, saying that, even after you would add a carrier,
i dontsee the mecanics of it actually sending an sms working, imean, i'd imagine you'd need an modem or sms gateway...
at some point, i actually heard a mcafee presales rep telling " Oh it will probably go through the email "
Dis you finally receive an answer to the post? Or have you figured out what the problem is?
I can't say how to edit the carrier but I can tell you that you don't need an SMS gateway. SMS are just sent as emails... E.g. email@example.com so when you edit the SQL you will just need to fins out what your carrier's email-to-txt address formatt is and enter it the same as the current entries.