There are three ways you can retrieve your voicemails:
1. Using the HulloMail mobile app in the message list.
2. Calling in with the following numbers (Currently there is no dial in number for Australia):
UK - +441216218500
US - +12026885555
IE - +35314849000
3. You can enable the option 'Copy to Email' which will automatically send a copy of the voicemail message or missed call to your registered email address.