Or it could be a radar that resonate with common GSM filter circuitries or Nokia BL-4C or something like that. Quoted problem definition is "find cellphones even when they were turned off", not "locate" or "track" "a phone" or "user turns off".

It's also supposedly something US JSOC is involved with, which is more like IRL Call of Duty group of people than black suited 007 or drone trailer people, so my intuition is that the system is more likely to look like a hearbeat sensor attachment than a cloud based offering.