nicks:
For example, would we see a new Trans-Tasman telco removing roaming rates across the Tasman as a point of difference but needing to raise them in other parts of the would due to loss of scale.
Well Vodafone AU don't charge roaming rates in NZ - you just use your plan rate / mins.
Vodafone NZ simply don't need to offer a deal like that because there is no competitive need for them to sacrifice the revenue - they already have the best roaming option by far out of the networks in NZ.
The irony of all of this is that ~10 years ago when VF NZ and AU wanted to scrap roaming charges they were basically told off the record by both the ACCCC and Commerce Commission that such a move would be deemed anti competitive, which is the whole irony of competition regulators who's job is not to ensure competition in a marketplace, not necessarily the best deal to the customer.