A comment posted to sbiddle's most recent blog alighted to 2degrees having a National Network. It included a link to the 2degrees website, and what do you know:
"We've spent big dollars building a network that lets you use your 2degrees mobile in 97% of the places that Kiwis like to live, work and play."
Check out the link: http://www.2degreesmobile.co.nz/coverage
Johnr is quite right, 2degrees have not built a National Network. They have built sites in Auckland, Wellington, Christchurch and Queenstown, and have an agreement with Vodafone for the rest of their network. (sbiddles blog post has some useful information about that arrangement too!)
I would never be one to knock 2degrees, on the contrary I think their concept and pricing are outstanding, and I am really pleased they are about to enter the NZ mobile market - it should really shake things up.
I just think that they should be a little bit careful when describing "their" network.