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Messages could be sent and received on ISDN phones, and these can send SMS to any GSM phone.
The possibility of doing something is one thing, implementing it another, but systems existed from 1988 that sent SMS messages to mobile phones usually messaging from one mobile phone to another mobile phone.
In 1933, the German Reichspost (Reich postal service) introduced the first "telex" service.
Friedhelm Hillebrand conceptualised SMS in 1984 while working for Deutsche Telekom.
This makes texting a quick and easy way to communicate with friends and colleagues, including in contexts where a call would be impolite or inappropriate (e.g., calling very late at night or when one knows the other person is busy with family or work activities).Sprint Telecommunications Venture, a partnership of Sprint Corp. made the initial phone-call to launch the network, calling Mayor Kurt Schmoke in Baltimore.and three large cable-TV companies, owned 49 percent of APC. One factor in the slow take-up of SMS was that operators were slow to set up charging systems, especially for prepaid subscribers, and to eliminate billing fraud, which was possible by changing SMSC settings on individual handsets to use the SMSCs of other operators.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.