How to turn off the sound on an iPhone 4 without using the switch?

The little switch thing on the side of my phone just broke on me and I'm at school. But even when I turn the sound all the way down, you can still hear it. And I can't have the sound going off during my classes. But I don't want to turn my phone off. How do I turn off the sound so its on silent without the little switch on the side of my iPhone?

Go to the settings app then to sound link and change it there.

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