![]() ![]() This was part of ISDN ( Integrated Services Digital Network) and since GSM is based on this, it made its way to the mobile phone. Under SS7, it is a "state" with a 160 character data, coded in the ITU-T "T.56" text format, that has a "sequence lead in" to determine different language codes and may have special character codes that permit, for example, sending simple graphs as text. SMS forms an integral part of Signalling System No. ![]() It was further developed under the leadership of Kevin Holley and Ian Harris (see Short Message Service). The first technical solution evolved in a GSM subgroup under the leadership of Finn Trosby. With Bernard Ghillebaert of France Télécom, he developed a proposal for the GSM (Groupe Spécial Mobile) meeting in February 1985 in Oslo. Almost every time, the messages contained fewer than 160 characters, thus giving the basis for the limit one could type via text messaging. Sitting at a typewriter at home, Hillebrand typed out random sentences and counted every letter, number, punctuation, and space. ![]() Friedhelm Hillebrand conceptualised SMS in 1984 while working for Deutsche Telekom. The University of Hawaii began using radio to send digital information as early as 1971, using ALOHAnet. In 1933, the German Reichspost ( Reich postal service) introduced the first " telex" service. In the late 19th century, the wireless telegraphy was developed using radio waves. The electrical telegraph systems, developed in the early 19th century, used electrical signals to send text messages. The sender of a text message is commonly referred to as a "texter". It may simply be referred to as a "text" in North America, the United Kingdom, Australia, New Zealand, and the Philippines, an "SMS" in most of mainland Europe, or an "MMS" or "SMS" in the Middle East, Africa, and Asia. The service is referred to by different colloquialisms depending on the region.
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