A cheap way to get Spark VoLTE if you're in an RCG VoLTE-only area.
Listed as supported by Spark VoLTE and the AU variant should be the same as the NZ variant.
Nokia 3.4 has a nice Snapdragon 460 chip which has better performance than other Spark phones in the price bracket.
Snapdragon 460 has A73 and A53 cores on an 11nm Samsung process. That's amazing for a budget phone!! A53 only phones are slower than turtles.
Other phones in this price bracket from Spark's own site (in NZD)
Samsung Galaxy A02s - $199 - yes VoLTE
(Much slower SD 450 chip with A53 cores only, big oof)
Nokia G20 - $279 - yes VoLTE
(Much slower MediaTek Helio G35 with A53 cores only, very big oof)
Samsung Galaxy A12 - $299 - yes VoLTE
(Much slower MediaTek Helio G35 with A53 cores only, very big oof)
Oppo A5 2020 - $299 - yes VoLTE
(Chinese phone, more expensive but actually is slightly faster than SD 460 and has A73/A53 cores, not bad)
Obligatory note: Yes it has been about $10 AUD cheaper in the past, but you couldn't actually get it shipped to NZ and no idea how long the $3 shipping will go on for etc.
TBH if you are spending this much effort risking not having proper warranty importing a phone. You might as well get the Poco m3 or something with snapdragon 6 series.