By 1918, 5700 ships had wireless telegraphy. Advertisement for a Wireless Telegraph(Scientific American, November 25, 1905)Police radios to CBs: Another valuable wireless communications service was initiated when the Detroit Police institute issued the first radio dispatch in 1921, operating in 2 MHz band...
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Detroit Police radio dispatch equipment in 1925 Pagers to Cell Phones: In the 1980s, the Regional Bell Operating Companies (RBOC) emerged after the breakup of the AT&T, and they began to offer low-data rate wireless text services for pagers. Cellular Digital Packet Data (CDPD) and Mobitex were data services that used a packet data network based upon cellular structure...
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