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What frequencies do touch tones use for which numbers?

April 26, 2017frequencies Numbers touch

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What frequencies do touch tones use for which numbers?

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The touch tone system uses pairs of tones to represent the various keys. There is a “low tone” and a “high tone” associated with each button (0 through 9, plus * (star) and # (octothorpe or pound symbol). The low tones vary according to what horizontal row the tone button is in, while the high tones correspond to the vertical column of the tone button.