Open the Notifications panel and touch New voicemail.
OR
Touch the Voicemail icon on the Home screen.
OR
Touch the Phone Key in the Quick Keys bar, then touch 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.