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I thought everybody knew phones don't really turn off, but I keep hear people online countering good protest security advice with "just turn it off".

"Off" is best described as a low-power state, even for Android. The radio (which has a built-in CPU) isn't disconnected from the battery.

What should you do with your phone if you're protesting or whatever? Leave it at home; or put it in a tested Faraday bag if you take it with you.

https://9to5mac.com/2021/06/07/ios-15-find-my-network-can-find-your-iphone-when-it-is-powered-off/