In my neighbourhood – no comment!
Before I forget – if you want to save roaming costs, just get yourself a prepay SIM card. Since Telecom NZ is not yet compatible with GSM (they will be next April or so), go into a Vodafone store and buy one! If I remember correctly, the card was about 25 NZ$, 10 NZ$ for talking included. 10 more, if you register in the internet. Topping up is very easy, just call 777 and register a credit card the first time. From then on you need you Vodafone PIN and the last 4 digits of your (registered) CC to top up. No charges for topping up! Oh, and for 1 NZ$ a day you get 10MB of internet traffic. Google for a possible APN, they have 4 of them with different features.
Lupines around Lake Tekapo make it even better. At night we saw more stars than ever on Mt John observatory – shooting stars, Tarantula nebula, Orion nebula and satellites included! We were taught how to locate the southern point which would be the Polaris star on the northern hemisphere. Thanks to the guides up there!