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Why is my iPhone making a mystery tritone sound when the sound is on, and a mystery vibrate when set to silent? Yes, yes, I already read this answer: Why does my iOS device beep at noon every day?. I learned the same thing at the Genius Bar. But I've already turned "Sounds" off in every app that doesn't appear in my notification center. So, now what?

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It turns out that there is one app that does not have a "Sounds" setting, but still produces sounds and vibrations: Calendar. It's easy to overlook the all-important setting "Calendar Alerts." Tap that, tap vibrate, scroll all the way to the bottom, and set vibration to "None." That should solve it.

Here's your problem right here:

Just turn vibration off:

That's right!

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