Ever wonder why your iPhone vibrates whether or not it’s set to silent mode? The answer lies in a simple setting that—depending on the number of calls you have coming in—might be able to eke out a little extra battery life throughout the day.
To change this, open up the Settings app, then tap on Sounds.
On that page you’ll see two on/off toggles labeled “Vibrate”—one under Silent, and one under Ringer and Alerts.
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