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call timer for mobile phones

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hello again!

i'm thinking of a device that would time a call that is separate from the phone.

It might use a LCD to display the call time. And I'm thinking of using a Cellular Phone calling detector to detect if a call is still in progress.

Its main application will be to inform the caller(user) if how long he has been on the phone.

Any insight would be much appreciated :)

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if you have a chance in access a spectrum analyzer, you will noticed that the cell phone isn't transmit continuously.

I suggested if you want to use the RF signal as the sourcce, you can use RF scottkey diode to pick up the RF signal, and sample its presence in a certain period of time, say for example 1s.

Hope this help

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