You could tune into the digital signals with a bit of SDR
<
https://en.wikipedia.org/wiki/Software-defined_radio> software and a bit
of kit. Although the signals are digitally encoded. Like trying to listen
to a broadcasted MP3 stream you need an MP3 encoder. So you would need the
digital encoder software. Which will probably be property of course. I
seen bits of kit for running your own GSM cellular network.
850/900MHz will mostly be used for GSM while 1800MHz will be used for data
mostly like 3G.
On 8 November 2014 05:21, Julian Smith <julian.smith@???> wrote:
> Semi relivant:
>
> http://berlin.ccc.de/~tobias/25c3-locating-mobile-phones.pdf
>
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