Tim Gray wrote:
> While the US is fairly behind the times on cellphones, I do believe
> most carriers have gone digital. It's just that not all providers use
> GSM - Sprint and Verizon do not use GSM, but something else (CDMA?).
> I don't know if those phones have a different signature of noise.
A CDMA phone uses a spread-spectrum transmission, and it sounds more
like white noise than GSM's pulsy noise on a narrow RF band. Analog
cellular is FM modulated, so with the right diode in your signal path
you can hear voices.
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"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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