Vodafone has a service called "Team Buzz" where people can sign up for advance notice of upcoming products and releases. From its terms and conditions;
3. Despite s18(1) of the Spam Act 2003 (Cth), I agree and acknowledge that any message Vodafone sends me will not contain an unsubscribe facility. I understand that I can, at any time, opt out of receiving marketing material by contacting Vodafone Customer Care.
The section of the Spam Act they refer to in this terms and conditions prohibits the sending of a message unless it has (among other things);
A statement to the effect that the recipient may use an electronic address set out in the message to send an unsubscribe message to the individual or organisation who authorised the sending of the first-mentioned message, or a statement to similar effect
This section is basically why spam emails have "click to unsubscribe" links in them.
I am curious if advising that customers can ring a number to be unsubscribed is a "statement to similar effect", I suspect it isn't, but in any event who in their right mind writes terms and conditions that start with a phrase like "despite a section of commonwealth legislation deliberately and specifically prohibiting it..." ?