PaulBrislen: I think you need to re-read your original post. Yes, you mention Vodafone and Vodafone NZ in particular.
The company that hasn't signed the deal is Two Degrees. You'd have to ask them why they haven't. Their deal with the othe Irish carriers may well be part of the deal they have with their SMS hub provider as Steve suggests. I don't know as I don't work for 2D.
I can assure you this has nothing to do with any conspiracy theory you've put forward.
I think you need to re-read his original post. He may have mentioned Vodafone NZ, but not in the context you're implying.