1. Open the dialer and press 1 then press the call icon. That should connect you to your voicemail.
2. The system will ask for your temporary password. Enterr 9999 followed by the # sign.
3. The system will ask you to create a new 4 digit password. Use password that you won't forget. Enter it again with # sign at the end.
4. Press 1 for computer generated message or press 2 to record your own personal greeting.
5. Press # to complete the setup. Done. source