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 Phone icon.
Touch and hold the 1 key to access voicemail.
Enter the current password, if prompted.
Tap the 4 key to access the personal options.
Tap the 2 key to access the administrative options.
Tap the 1 key to access the password options.
Tap the 1 key to change the password, then follow the instructions to enter a new password.