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Turning off your phone doesn't disable the microphone. You have to physically remove the battery.



I know that was the case with Nextel phones, is that the same with iOS devices?


There's no evidence to the contrary, and Apple was named in the PRISM scandal, so you have to operate under the assumption that it is. Sell it and buy a non-smartphone with a removable battery.


That type of spying capability is implemented in the telephony baseband. It is commanded using the signalling channel of telephony protocols. Whether or not it is in a particular device depends on the chips that connect to the telephone network.


Wonder if there is a market for phone modifications that add an external on/off switch for the mic's (and speakers). Silly but paranoia sells.




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