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The volume controls are on the left side of the iPhone (again, when you're holding the phone in portrait orientation), right below the Ring/Silent switch (see Figure 1.1). The button closer to the top of the iPhone is Volume Up, and you press it to increase the volume; the button closer to the bottom of the iPhone is Volume Down, and you press it to decrease the volume. As you adjust the volume, a slider appears on‐screen representing the volume level.

You use these buttons to control the volume throughout your iPhone:

 If you're on a call, the volume controls adjust your speaker volume.

 If you're using the Music app, the volume controls adjust the music volume.

 In all other situations, the volume controls adjust the output of sounds such as alerts and effects.