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The electrical telegraph systems, developed in the early 19th century, used simple electrical signals to send text messages.
In the late 19th century, the wireless telegraphy was developed using radio waves.
Like e-mail and voicemail, and unlike calls (in which the caller hopes to speak directly with the recipient), texting does not require the caller and recipient to both be free at the same moment; this permits communication even between busy individuals.
Text messages can also be used to interact with automated systems, for example, to order products or services from e-commerce websites, or to participate in online contests.
Advertisers and service providers use direct text marketing to send messages to mobile users about promotions, payment due dates, and other notifications instead of using postal mail, email, or voicemail.
The service is referred to by different colloquialisms depending on the region.
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 permit, for example, sending simple graphs as text.
American Personal Communications (APC), the first GSM carrier in America, provided the first text-messaging service in the United States.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.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.