How do I lower the volume on my Samsung Galaxy S4?

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AC Question

Samsung Galaxy S4: Voicemail volume problem (too loud)

My voicemail volume doesn't seem to be adjustable. When a voicemail is playing and I click down the volume with the buttons (on the side of the phone), it shows the phone icon for the ringer volume and lowers that. My voicemail is playing so loud that everyone around me can hear the contents of my voicemail, which is a problem when it's something personal (like a doctor's office call). Anyone have any ideas/suggestions?