To be able to use Voicemail

From the Home screen, tap the Apps Key > Voicemail or tap the Voicemail Icon 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 have subscribed to the visual mail service, the Visual Voicemail application will be launched. If you are not subscribed, you will be dialed into your traditional voicemail box.
The first time you access the Voicemail application, you will have to subscribe to the Visual Voicemail service to be able to use it.
After subscription to the Visual Voicemail service, you will be prompted to enter the password.
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 (or press) the Menu Key .The following options are available: Search, Delete, Save as, Mark as heard, Sort by, Saved voicemails, Refresh, Settings, Logout, and Unsubscribe.
Tap a voicemail entry to listen to it. Then you can tap Call back, Save, Delete, or Speaker. To forward or reply to a message, tap (or press) the Menu Key > Forward or Reply.
If you decide to reply with a voicemail or forward it, record a message. The buttons at the bottom of the screen allow you to record, stop, re-record, or cancel the message.