To change your voicemail password, you must know your current voicemail password. Note: If you've forgotten your password here's how to reset it.
From the home screen, tap Apps.
Swipe to then tap Visual Voicemail.
Press the Menu key, then tap Settings.
Tap Change voicemail password.
Enter your existing password, then tap Continue.
Enter the desired new voicemail password, then tap Continue.
Re-enter the desired new voicemail password for confirmation, then tap Finish. Note: To change the voicemail password from the dialpad, press and hold '1', enter the current password, then follow the voice prompts to change the voicemail password.