Short Message Service
Short Message Service (SMS) is a text messaging service component of most telephone, World Wide Web, and mobile telephony systems.It uses standardized communication protocols to enable fixedline/landline 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, as used on modern handsets, originated from radio telegraphy in radio memo pagers that used standardized phone protocols. These were defined in 1985 as part of the Global System for Mobile Communications (