Find "Voicemail number"
Slide your finger down the display starting from the top edge of your phone.
Press Settings.
Press 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.