While 2degrees have completed their 3G network shutdown, one.nz & Spark are still mid throes of pulling their services.
Spark have discounts on new phone upgrades, until the beginning of March, in store only:
https://www.spark.co.nz/online/shop/mobile-devices/3g-shutdown
One.nz say there is an in store promo code for getting a discount, but do not detail how generous that is:
https://one.nz/3g-shutdown/#phone-offers





