A very useful part of this submission is the permission setup (setpref) for Gmail. Matlab's documentation did not result in my being able to send texts from Gmail, but Ke Feng's permissions did. Interestingly I can text all kinds of carriers from my Gmail account but not from my work email, maybe because the authentication level is higher. If you have to text a bunch of people on different carriers and are having trouble, try doing it from Gmail using Ke Feng's permissions.