If I brought an iPhone 6 plus in Australia would I be able to use it in New Zealand?

If I brought an iPhone 6 plus in Australia would I be able to use it in New Zealand?

Added (1). And would it work as would a New Zealand one should?

Yup if its unlocked

Depends on the carrier

If the iPhone 6+ is unlocked, you can use it in NZ without any issue. If you need unlocked iPhone 6+ at reasonable price, mail me for more info.