The second page, on the right, the last bullet point, suggests such deep integration: https://web.archive.org/web/20170708204409/www2015.wwwconference.org/docu

The second page, on the right, the last bullet point, suggests such deep integration: https://web.archive.org/web/20170708204409/www2015.wwwconference.org/documents/proceedings/proceedings/p355.pdf https://web.archive.org/web/20170708204409/www2015.wwwconfer... Whether FCM uses these technologies, I don't know. I lack the hardware to easily inspect the mobile radio traffic on the necessary level (the best would be a DIY stingray based on one or two OsmocomBB-capable GSM phones, maybe combined with a Faraday cage to place one of them into, together with the smartphone.