Click the "Speaker" icon at the lower-right corner of the taskbar next to the "Time" indicator to open the volume control. Click on the "Mute" button in the lower-left corner to turn the sound back on.

How do I find the mute button?

If you have an Android phone, you can mute your phone from the call screen. Your call screen has different buttons including a mute button (circled below). It is a microphone with a slash line through it. Please click on this button to mute and unmute your hone.

How do I turn off the mute?

Use the Settings menu. Select the "Settings" icon from the Android phone's home screen. Select "Sound Settings," then clear the "Silent Mode" check box.