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Disable Siri's 'raise to speak' feature
Siri can be activated by holding your iPhone close to your face, as though you're having a face-to-face talk with the intelligent assistant. But the proximity hardware sensor is always checking to see if you are nearby. This may impact the battery over the course of the day.
Head to Settings > General > Siri, then disable the Raise to Speak button to disable the feature. The alternative isn't so bad: You can still hold down the home button to speak to Siri.