this is true of google android and iOs, however I understand it is NOT the case for graphene OS
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but you have verified gaussmeter evidence that it is true?
Your phone could be made of magic, but it's still gonna leave a record of your movements with the cellular towers.
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Carrier pigeons solves this
I don't think you'd use a gaussmeter but rather a mobile base station so you can measure the incoming pings
This was the approach used by SRLabs when testing their Blue Merle software for IMEI switching

GitHub
GitHub - srlabs/blue-merle: The blue-merle package enhances anonymity and reduces forensic traceability of the GL-E750 Mudi 4G mobile wi-fi router
The blue-merle package enhances anonymity and reduces forensic traceability of the GL-E750 Mudi 4G mobile wi-fi router - srlabs/blue-merle