Listening to your voicemail messages in the mobile app is quick and easy. After you open your mobile app, click on the "Voicemail" link from the bottom of your screen. The app will list all messages you are subscribed to, with the newest at the top.
From here, you can play your messages directly on your phone and also view detailed call information by clicking on the "Call Detail" button (the red "i" in a circle) on the right-hand side of the record.