How would one go about detecting the IMSI commands? Would an advanced radio receiver be able to see these? I know pretty much nothing about SIGINT but been contemplating spending some time learning about it.

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yencabulator 5 days ago | parent [-]

https://github.com/EFForg/rayhunter/

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notherhack 3 days ago | parent [-]

" So far Rayhunter has not turned up any evidence of cell-site simulators being used to spy on protests in the US — though we have found them in use elsewhere. ... But we’ve received reports from a lot of protests, including pro-Palestine protests, protests in Washington DC and Los Angeles, as well as the ‘No Kings’ and ‘50501’ protests all over the country. So far, we haven’t seen evidence of CSS use at any of them. "

	▲	yencabulator 3 days ago \| parent [-]
		Sounds like that's now stale information: https://news.ycombinator.com/item?id=45184758