https://www.youtube.com/watch?v=xnXMKRIqkZ4
https://github.com/ptrkrysik/multi-rtl
http://kaira.sgo.fi/2013/09/16-dual-channel-coherent-digital.html
https://hackaday.com/2010/12/30/gsm-hacking-with-prepaid-phones/
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