By the end of 2010, SMS was the most widely used data application, with an estimated 3.5 billion active users, or about 80% of all mobile phone subscribers. SMS rolled out commercially on many cellular networks that decade and became hugely popular worldwide as a method of text communication. The first test SMS message was sent on December 3, 1992, when Neil Papworth, a test engineer for Sema Group, used a personal computer to send "Merry Christmas" to the phone of colleague Richard Jarvis. These were defined in 1986 as part of the Global System for Mobile Communications ( GSM) series of standards. SMS technology originated from radio telegraphy in radio memo pagers that used standardized phone protocols. An intermediary service can facilitate a text-to-voice conversion to be sent to landlines. It uses standardized communication protocols that let mobile devices exchange short text messages. SMS ( Short Message Service) is a text messaging service component of most telephone, Internet, and mobile device systems. E.161, a common mobile keypad alphabet layout
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