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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.
It has grown beyond alphanumeric text to include multimedia messages (known as MMS) containing digital images, videos, and sound content, as well as ideograms known as emoji (happy faces, sad faces, and other icons).
GSM was allowed in the United States and the radio frequencies were blocked and awarded to US "Carriers" to use US technology.
Hence there is no "development" in the US in mobile messaging service.
In 1933, the German Reichspost (Reich postal service) introduced the first "telex" service.
Friedhelm Hillebrand conceptualised SMS in 1984 while working for Deutsche Telekom.
Finnish Radiolinja became the first network to offer a commercial person-to-person SMS text messaging service in 1994.