To be able to use Voicemail

Tap the Home Button > the Apps icon > the 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 Voice Mail service. When you tap the Voicemail button on the dialpad, and you've subscribed to the Visual Voice 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 Voice mail app, you'll have to subscribe to the Visual Voicemail service to be able to use it.
After subscription to the Visual Voice mail 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 .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.