Okay, chick who works for Telstra is back ^.^
It Is Vodafone, confirmed. The called me, I answer, nice lady asked me if I wanted to upgrade my phone as I was half-way through my contract, I asked her to quote my phone number and full name before I would answer anything. At first she said she wasn't allowed to give out confidential information, but then I said, she had called Me and I had to confirm with whom I was speaking. She obliged, then asked me if I wanted to upgrade my handset, if I was happy with my plan and all that. And I asked her to look on her records and check when I last upgraded my phone and if she thinks she can best that (as I had just claimed insurance and gotten the newest phone in that range), she then read through the notes and said, "oh I can see here that you just made and insurance claim and currently have the "blah blah model number" .. That's the newest one out .. So your happy with your plan then?" and the usual preamble. But to state it clearly yes this is Vodafone, it is a ONE way number, you cannot call it back, you cannot message it, but if you contact Vodafone on 1555 they will confirm it is a Vodafone sales rep or whatever trying to sell you stuff.. That and I checked on our systems at work and we have it registered to the Vodafone corporation as a sales number :P