Simon 3 is old...it dials, thats it.
It will not text you, is has no connection to a texting server, and any dtmf based system is not text capable.
As far as hitting *....make sure your phone is sending DTMF * when you hit star....some phones have an option to turn this on.
This is a poor method of monitoring...you might as well just not monitor it at all. Not being negative...just shooting straight. I understand what you "want" to do...