It depends on if you have the basic non-visual voicemail or a visual voicemail. Basic has notification at the top of the screen which you can't dismiss until you listen to the voicemail. The visual voicemail notifies you through the Visual Voicemail application or through the dialer application for the Pixel phones.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
