Why does my iPhone 5 makes a swish/swoosh noise?

Why does my iPhone 5 make a swish or swoosh noise when I'm using it? I have all of the alerts, notifications, and sounds turned off. And I turned my ringer all the way down. I check my email, messages, and notification page, but can't find where it's coming from. Isn't there a way to make it completely silent?

Try pulling down the little switch on the left side above the volume buttons.

Means you are sending an email or posting to facebook

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