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Packet radio
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== Implementations == Many commercial operations, particularly those that make use of vehicle dispatch (e.g. taxis, tow trucks, police) were quick to note the value of packet radio systems to provide simple mobile data systems. This led to the rapid development of a number of commercial packet radio systems:<ref>DeRose, James F. (1999). "The Wireless Data Handbook", pp.3β7. Wiley-Interscience; 4th edition. {{ISBN|0-471-31651-2}}.</ref> * MDI (1979) * DCS (1984) * DRN (1986) * [[Mobitex]] (1986) * ARDIS (1990) * [[CDPD]] allowed packet data to be carried over [[Advanced Mobile Phone System|AMPS]] analog cellular telephone networks * [[GPRS]] is the packet data facility provided by the [[GSM]] cellular telephone network
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