The best way to answer this is to say that we send things out using SMTP and do not support SMS at this point from DPA.
If your carrier can handle the SMTP traffic and convert to SMS, this may be feasible, but testing locally, I found that I could not get it to work.
I have t-mobile though and there may be some configuration in my account preventing this.
Basically this works PhoneNumber@txt.att.net. in SQL server sending out through SMTP. But when we add this is in DPA we get validation that it worked but it never got to the SQL server when we check the SQL mail log.