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The Digital Advanced Mobile Phone Service (D-AMPS or DAMPS) is a digital version of Advanced Mobile Phone System (AMPS) — the original analog standard for cellphone service in the United States. D-AMPS uses frequency ranges within the 800 and 900 Megahertz (MHz) electromagnetic radiation spectrum.
D-AMPS adds Time Division Multiple Access (TDMA) to AMPS to get three channels for each AMPS channel, tripling the number of calls that can be handled on a channel. D-AMPS is Interim Standard-136 from the Electronic Industries Alliance (EIA).