"Faraday-shielded sites that are occasionally visited by iPhone users"
I would hope that such a site would have a strictly-enforced "no devices" policy in place!
Apple's Find My network, used to locate iOS and macOS devices – and more recently AirTags and other kit – also turns out to be a potential espionage tool. In short, it's possible to use passing Apple devices to sneak out portions of information from one place to another, such as a computer on the other side of the world, over …
I seem to recall that attempts to get American politicians like Donald Trump and Hillary Clinton to practice some sort of secure handling of cell phones within classified environments were reported to be less than a total success. I suspect that will be true of their peers worldwide.
I can't speak for our colonial cousins, but on MoD sites in the UK it's very common to have armed guards requesting that one put any mobile devices, memory sticks, or digital media of any sort into a locker before entering certain areas.
Which can make administration work on servers a bit of a chore.
Sure, they do it for you but what about Boris Johnson and other high level government people? Are those armed guards at MoD sites requiring the same of the brigadier general in charge? It would only take one guy getting in without having to give up his iPhone (or Apple Watch?) for this attack to work.
Granted, you better have some pretty tiny data you're looking to steal. i.e. it could work if you somehow had stolen a very important private key and were able to use this to push it onto someone's phone to carry to the outside world. The detailed plans for a new aircraft carrier, not so much.
But ... but ... what about the one on Doctor Who? Surely show about a time traveling alien strives for accuracy in its representation of a secret military organization in the UK?
Anyway, substitute whatever some high rank the UK currently uses in...you get my point.
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