cellphone question

If you could then clean up the audio into a reasonable digital waveform, in the right format, and somehow then get it into a cellphone provider's software package, then I guess that you could, but I'm not sure that it would tell you anything useful. AFAIK, it's just a response from the phone, to the question " OI !! Are you still there ? Yes ? OK, let's set up a channel 'cause I'm about to ring you " or something along those lines, sent by the last cell that the phone had become registered on. Perhaps others on here know a lot more about it, but I think that's something like I remember reading it.

Of course, what you're hearing may not be a data stream as such, at all. It may just be as a result of the phone's RF output frequency hopping about all over the place on some kind of spread spectrum scheme. Again, others here might be able to give a better answer on that.

Arfa