This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Have you decided which SMS service provider you will sign up with? Each of them probably has their own API you would need to use. If you haven't decided which one to use, search for "bulk sms sending" or some such phrase.