To change your voicemail password, you must know your current voicemail password. Note: If you have forgotten your existing voicemail password, you will not be able to access Voicemail until you reset your voicemail password.
From the home screen, tap the Apps icon.
Swipe to, and then tap Visual Voicemail.
Tap the Menu icon.
Tap Settings.
Tap Change voicemail password and follow the directions to change the password.