Find "Voicemail number"
Press Menu.
Scroll to Messages and press the Navigation key.
Scroll to Settings and press the Navigation key.
Scroll to Voicemail number and press the Navigation key.
Save the voicemail number
Press the Navigation key and key in the required number.
Scroll to Number and key in (prefix) 5 (your phone number)
Press the Navigation key.
Return to the home screen
Press Disconnect to return to the home screen.