These were defined in 1985 as part of the Global System for Mobile Communications (GSM) series of standards.
The protocols allowed users to send and receive messages of up to 160 alpha-numeric characters to and from GSM mobiles.
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should be available in the mobile system." The GSM is optimized for telephony, since this was identified as its main application.
The key idea for SMS was to use this telephone-optimized system, and to transport messages on the signalling paths needed to control the telephone traffic during periods when no signalling traffic existed.
WP4 created a Drafting Group Message Handling (DGMH), which was responsible for the specification of SMS.
The first action plan of the CEPT Group GSM was approved in December 1982, requesting that "The services and facilities offered in the public switched telephone networks and public data networks ...
The technical development of SMS was a multinational collaboration supporting the framework of standards bodies.
Through these organizations the technology was made freely available to the whole world.
The definition that Friedhelm Hillebrand and Bernard Ghillebaert brought into GSM called for the provision of a message transmission service of alphanumeric messages to mobile users "with acknowledgement capabilities".
The last three words transformed SMS into something much more useful than the prevailing messaging paging that some in GSM might have had in mind.