(SMS) is a text messaging service component of telephone, World Wide Web, and mobile telephony systems. It uses standardized communications protocols to enable fixedline or mobile phone devices to exchange short text messages
SMS was the most widely used data application, with an estimated 3.5 billion active users, or about 80% of all mobile phone subscribers, at the end of 2010. SMS is also employed in mobile marketing , a type of direct marketing. SMS as used on modern handsets originated from radio telegraphy in radio memo pagers using standardized phone protocols.