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.This proposal was further elaborated in GSM subgroup WP1 Services (Chairman Martine Alvernhe, France Telecom) based on a contribution from Germany.
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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 ...
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.
In this way, unused resources in the system could be used to transport messages at minimal cost.
However, it was necessary to limit the length of the messages to 128 bytes (later improved to 160 seven-bit characters) so that the messages could fit into the existing signalling formats.
Based on his personal observations and on analysis of the typical lengths of postcard and Telex messages, Hillebrand argued that 160 characters was sufficient to express most messages succinctly.
A new network element required was a specialized short message service centre, and enhancements were required to the radio capacity and network transport infrastructure to accommodate growing SMS traffic.
Short Message Service (SMS) is a text messaging service component of phone, Web, or mobile communication systems.
It uses standardized communications protocols to allow fixed line or mobile phone devices to exchange short text messages.
SMS as used on modern handsets originated from radio telegraphy in radio memo pagers using standardized phone protocols.
These were defined in 1985 as part of the Global System for Mobile Communications (GSM) series of standards Though most SMS messages are mobile-to-mobile text messages, support for the service has expanded to include other mobile technologies, such as ANSI CDMA networks and Digital AMPS, as well as satellite and landline networks.