From
http://www.itwire.com/content/view/16144/127/

Telecom New Zealand, which at present operates only a CDMA network, is
having to put in place a number of measures, including free loan phones, to
ensure that its mobile customers will still be able to make and receive
calls when they come to Australia.

The company says that some five percent of its mobile customer base visited
Australia in the past two years. These would include a significant number or
corporate and business customers who are frequent visitors.

Telecom's GM business solutions, Greg McAlister, said Telecom was
implementing an extensive communications plan "to make sure customers are
aware of the closure, and give them plenty of time to take up one of the new
options to use mobile phones while in Australia."

The optimal solution is a dual mode GSM/CDMA "Worldphone" - the Samsung W531
which Telecom sells for $NZ299. However it means that New Zealanders wanting
the ability to roam to Australia have a choice of only one model. Telecom is
offering any Kiwis venturing across the ditch the loan of one free
(exclusive of call charges) for the duration of their trip. Also, Telecom
says that new dual mode handsets will be available later this year.
Customers who loan a phone can use their own mobile number and voicemail and
will be billed standard roaming charges.