Open the Notifications panel and tap New voicemail.
OR
Tap the Voicemail icon on the Home screen.
OR
From the Home screen, tap the Phone Key in the Quick Keys
bar, then tap the Voicemail Key
. Typically, your carrier’s voicemail
system guides you through the process of listening to and managing
your voicemail. The first time you call your voicemail, it also guides
you through the process of recording greetings, setting a password,
etc.