edward snowden himself demonstrated a phone case about 13 years ago that showed that even in airplane mode and even when turned off most phones emit radio signals
welcome to 13 years ago, it's way way way worse now
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this is true of google android and iOs, however I understand it is NOT the case for graphene OS
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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The only way is to remove the battery, which was easy on cell phones 20 years ago. Now the quickest and easiest way would be to destroy the phone