I live in New Zealand. I live in New Zealand and use the 3G Telecom EV DO REV-A network for mobile

Question

I live in New Zealand and use the 3G Telecom EV DO REV-A network for mobile broadband. If I purchase a Sprint/AT & T Sierra Wireless 595U Aircard from the USA, can I use it in NZ on the Telecom network (if there is no contract on the card), or does it have to be used with Sprint/ AT & T etc