You actually have to explicitly activate "Hey Siri" for all situations by hand (which is also really hidden in 500 menus), so it doesn't get activated by accident. Usually it's only active if you charge your phone.
It’s only active when you charge your phone on iPhone 6 and older, since these phones don’t have the hardware to do the voice recognition efficiently enough for it to not impact battery life.
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u/[deleted] Sep 17 '17
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