Key Highlights • SMS is transmitted to your phone regardless of a poor network signal or the absence of internet access. • It is less intrusive than a phone call and more effective than email. • SMS has a good response and open rate as well. SMS is regarded as an efficient and common method of communicating with an audience. However, it is now under attack from data-driven messaging services, as you are paid by your network operator for every SMS you send to any of your contacts, as opposed to mobile-application-delivered messages, which are nearly free.