I wonder if we would need to "unbundle" Vodafone too, seeing that their "low land-to-mobile calls" is actually only with their own IHUG service:

Vodafone first to lower land-to-mobile calls
Following the government’s reduction of mobile termination rates, Vodafone is the first telecommunications provider to act by lowering the price of landline calls to mobile for its ihug home phone customers.

From July 1, ihug customers have been making calls from their home phones to mobiles at a new low price of 39 cents per minute, one of the cheapest rates in New Zealand. 

“Vodafone was already offering businesses the lowest land to mobile rate available with their new business rate calling plan, but for consumers this is now the cheapest, most widely available price,” says ihug’s chief executive Mark Rushworth.

Rushworth says, unlike offerings from other providers, the new price is for calls to all mobile networks and doesn’t require customers to be on a special plan.  

“Any customer who has ihug home phone with one of ihug’s latest calling plans gets this cheap rate.  So our existing customers will see a price drop of between 13% and 20%, depending on which calling plan they were previously on.

“Vodafone has committed to reducing the price of landline to mobile calling in New Zealand and to passing those savings on to customers - this is just the first example of that commitment,” says Rushworth.

The new price compares with 49 cents per minute from Orcon, up to 71 cents per minute from TelstraClear and up to 71 cents per minute from Telecom.