Generally, 28GHz signals have low diffraction, which means it is difficult for them to be available indoors, the company explained.
Latest from Campbell Kwan
With the rollout, Samsung becomes the first new radio network vendor to deploy a commercial network in New Zealand in over a decade.
The test was conducted in Samsung's 5G lab based in South Korea.
Orange and Proximus will use Nordic network equipment instead.
Huawei continues to be on the US Entity List, however.
Bharti Airtel, MTNL, Reliance Jio, and Vodafone have all received approval to commence 5G trials as the nation continues to prepare its rollout of commercial 5G networks.
Around 100 people will be employed to run the factory.
The spectrum will be auctioned off by the FCC once services rules are finalised.
That number could grow to over 400 in the next two to five years, the company said.
After performing 5G testing of the low band spectrum since November last year.