Find "Voicemail number"
Slide your finger down the display starting from the top edge of your phone.
Press the settings icon.
Press the settings icon.
Press Call.
Press Voicemail settings.
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 key several times to return to the home screen.