At Services:Profile-Messaging establish an email address in the format of {Phone-Number}@{carrier specific domain}
At Services:Profile-Messaging select which Notifications will be sent to the phone
For instance, an Email sent to 6505559007@vtext.com will go to the Verizon subscriber carrying a phone with the number (650) 555-9007
See http://www.verizonwireless.com/news/article/2013/06/computer-to-phone-text-messaging.html for a bit more about Verizon specifically. The other carriers (AT&T, etc.) have a similar "syntax".