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Text messages are used for personal, family, business and social purposes.
This was part of ISDN (Integrated Services Digital Network) and since GSM is based on this, made its way to the mobile phone.
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 GSM in the US had to use a frequency allocated for private communication services (PCS) – what the ITU frequency régime had blocked for DECT – Digital Enhanced Cordless Telecommunications – 1000-feet range picocell, but survived.
American Personal Communications (APC), the first GSM carrier in America, provided the first text-messaging service in the United States.