Find "Voicemail"
Press Menu.
Scroll to Settings and press the Navigation key.
Scroll to Call settings and press the Navigation key.
Scroll to Voicemail and press the Navigation key.
Enter the voicemail number
Press Options.
Scroll to Edit and press the Navigation key.
Highlight the field below voice mail.
Key in (prefix) 5 (your phone number) and press OK.
Press Yes to confirm.
Exit
Press Disconnect to return to standby mode.