To be able to use Voicemail

From the Home screen, tap the Apps icon (in the QuickTap bar) > the Apps tab (if necessary) > Verizon folder > Voice Mail or tap Voice Mail directly on the Home screen.

NOTE
Listening to voicemail and setting up your voicemail service depends on subscription to the visual mail service. When you tap the Voicemail Key on the dialpad, and you've subscribed to the visual mail service, the Visual Voicemail app will be launched. If you're not subscribed, you'll be dialed into your traditional voicemail box.
The first time you access the Voicemail app, you'll have to subscribe to the Visual Voicemail service to be able to use it.
After subscription to the Visual Voicemail service, you'll be prompted to enter the password. To change the password, call voicemail (dial *86).
After entering the password, your voicemail entries will be displayed in your Inbox.

While viewing the voicemail list, you can select an entry (see step 5). For additional options, tap the Menu icon (at the upper-right corner of the screen).The following options are available: Search, Save, Set as heard, Sort by, Saved Voice Mail, Refresh, and Settings.
Tap a voicemail entry to listen to it. Then you can tap Call back, Save, Delete, or Speaker.