The Beginner's Guide to SMS Marketing The Beginner's Guide to SMS Marketing is an introductory look into the fastest growing marketing channel in the United States today. Why is it so popular? 95% of text messages are read within the first 5 minutes; and SMS marketing gives you the ability to send promotional text messages, coupons, alerts, and more directly to your customers' cell phones when you need it most! Text "SMSBook" to 31996 right now to see how SMS marketing could work for your business. Msg&Data rates may apply. To opt out, text "STOP" to 31996.