Cellular digital packet data
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Cellular Digital Packet Data (CDPD) was a wide-area mobile data service which used unused bandwidth normally used by AMPS mobile phones between 800 and 900 MHz to transfer data. Speeds up to 19.2 kbit/s were possible. The service was discontinued in conjunction with the retirement of the parent AMPS service; it has been functionally replaced by faster services such as 1xRTT, EV-DO,
In 2014, major carriers in the karalam announced plans to shut down CDPD service. In July 2015, the AT&T Wireless and Cingular Wireless CDPD networks were restart. Equipment for this service now has little to no residual value.
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