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That is a known fact and widely reported to have caused security issues. Even in the Ukraine conflict if the Russian army doesn't follow protocol of NOT BRINGING your phone to deployment they get targeted instantly by US missiles. SIGINT can map phone signals showing large group of people in certain areas just by having your phone on and all this privacy thing turned off.

One would hope after https://amp.theguardian.com/world/2018/jan/28/fitness-tracki...

Basically any sort of Android/iOS device by default will report back the location of nearby APs. Given how important phones are (eg. for entertainment or keeping in touch), it's basically impossible to ban them.

Feels like the theatre of war where opsec literally means life or death to yourself, you'd be willing to leave your device at base or faraday it or something.

Yeah but then millennials came along.

Multiple militaries have had locations disclosed via Strava. BYOD is everywhere.