To listen to your Voicemail
Open the Notifications panel and tap New voicemail.
OR
Tap the Voicemail icon
on the Home screen.OR
Tap the Home Button
> the Phone icon 
> Dial tab > the Voicemail button 
(on the dialpad).
Open the Notifications panel and tap New voicemail.
OR
Tap the Voicemail icon on the Home screen.
OR
Tap the Home Button > the Phone icon > Dial tab > the Voicemail button (on the dialpad).