Find "Voicemail number"
Slide two fingers down the display starting from the top edge of your phone.
Press Shortcut to Settings.
Press Shortcut to Settings.
Press Call settings.
Press Voicemail.
Press Setup.
Press Voicemail number.
Save the voicemail number
Key in (prefix) 5 (your phone number) and press OK.
Return to the home screen
Press the home icon to return to the home screen.