<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> Short Message Service (SMS) is a text messaging service component of most telephone, World Wide Web, and mobile device systems . It uses standardized communication protocols to enable mobile devices to exchange short text messages . An intermediary service can facilitate a text - to - voice conversion to be sent to landlines . SMS was the most widely used data application, with an estimated 3.5 billion active users, or about 80% of all mobile subscribers, at the end of 2010 . </P>

1. as part of gsm describe the three rudimentary services provide by sms