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there’s only two ways you are preventing carrier/google/apple signals coming out of a phone and giving yourself away:
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its something like a pinephone that has no google/apple services running and you have a physical toggle to turn off bluetooth, wifi, data
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a faraday bag
Govts and corpos will use bluetooth and wifi mac addresses to ID and track people. luckily more and more devices are shipped with wifi mac randomization.
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