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 permits, for example, sending simple graphs as text.
This was part of ISDN (Integrated Services Digital Network) and since GSM is based on this, made its way to the mobile phone.
The Sprint venture was the largest single buyer at a government-run spectrum auction that raised $7.7 billion in 2005 for PCS licenses. SMS is available on a wide range of networks, including 3G networks.
APC operated under the brand name of Sprint Spectrum and launched its service on November 15, 1995 in Washington, D. However, not all text-messaging systems use SMS; some notable alternate implementations of the concept include J-Phone's Sky Mail and NTT Docomo's Short Mail, both in Japan.
Sitting at a typewriter at home, Hillebrand typed out random sentences and counted every letter, number, punctuation, and space.
Almost every time, the messages contained fewer than 160 characters, thus giving the basis for the limit one could type via text messaging.
The electrical telegraph systems, developed in the early 19th century, used simple electrical signals to sent text messages.