I don't know if the carrier will allow you to import/connect the handset.
It is my understanding that there is more than just unlocking the phone, there are operator specific settings and software which need to be applied to the phone.
I would check with the carrier first.
Also, http://www.telepermit.co.nz/nl137.html#sec3 has a section (quoted below) about the locking (which you probably want removed).
"Unfortunately, fraudulent purchases of subsidised handsets by people signing up for long term contracts, then going overseas and ignoring their service contract obligations, have been rife in recent years. Mobile service providers worldwide have thus been protecting their interests by arranging for the manufacturer to provide security coding specific to the handsets they have subsidised. This Software Protection Code (SPC) prevents a handset being re-programmed by other than the original service provider."
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