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These days basic Software Defined Radio (SDR) kit has become very affordable so you can now obtain the RTL-SDR USB stick for about $15 and perform some GSM sniffing on a standard laptop running Wireshark. The GSM capture is done using the RTL-SDR and the airprobe tool (which builds on GnuRadio) that relays the packets to Wireshark, via the GSMTAP port (UDP ...

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