Vodafone AU
It seems not is all right in the Vodafone Australia network right at this moment, with Vodafone advising that some users are experiencing issues with Data, Voice and Text services on their network.

There’s no specifics of the details, but it appears to be an intermittent issue. Vodafone has posted out this announcement across their social media channels:

There’s a standard message being sent to anyone enquiring about service outages at the moment on Twitter reflecting the message above:

Currently AussieOutages shows a heat map for reports of Vodafone issues listing reports in Sydney, Ryde, Parramatta, Perth, Melbourne, Adelaide, Ashfield, Brisbane, Burwood, and Greenacre.
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Update:
Vodafone advise that the issue has been resolved:

We’ll follow up with Vodafone through the night as they update.
Are you having issues on the Vodafone network?