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Launch the Settings app
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Scroll down to Siri & Search
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Tap the toggle switch next to Listen for “Hey Siri” (turns green when On)
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Tap Enable Siri
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Set up “Hey Siri” page is displayed. Tap Continue
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You will be asked to speak into iPhone starting with “Hey Siri”
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“Hey Siri” ready page is displayed. Tap Done
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“Hey Siri” is now activated through your voice on that iPhone