Is this an upgrade or new contract @pauljtin ?
Try Cancel all diverts.
Press Phone.
Press Keypad.
Key in ##002# and press the call icon.
It's advised to get in touch with Vodafone via Customer Services on 191 or Live Chat if the usual shortcode does not work.
How-do-I-set-up-and-manage-my-voicemail.
Current Phone >
Samsung Galaxy s²³ Ultra 512gb Phantom Black.
