How to use an iphone from Australia in New Zealand?

I have an iPhone 3gs 8gb from Australia (cos that's obviously where I live) and I'm going on a holiday to New Zealand in a few weeks, I was just wondering what I have to do to be able to use my iPhone in New Zealand?
I was looking at phone companies and I noticed that Vodaphone runs in New Zealand and if I take out my Virgin Mobile Australia sim card and put in the Vodaphone NZ sim card, will it work like normal if I buy credit?

When you get to New Zealand go into a telecom shop and ask them they will be able to tell you if you can or can't use it!

Yes it will work fine.

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