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Cellular Digital Packet Data (CDPD) uses unused bandwidth normally used by AMPS mobile phones between 800 and 900 MHz to transfer data. Speeds up to 19.2 kbit/s are possible.
As of the year 2004, major carriers in the USA are threatening to shut down CDPD service. AT&T will give out no new IP addresses. The threatened shutdown has been delayed several times (the service has a number of entrenched users and no easy direct replacement exists).
External link
- CDPD (http://www.wirelessready.org/nettech_cdpd.asp) from Wireless Ready Alliance
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