Pendants and bracelets sold as protection against 5G radio waves are radioactive, officials in Europe have warned.
A wider launch isn't scheduled to take place until into the new year.
The network build is starting immediately.
The two reviews were published in the Journal of Exposure Science and Environmental Epidemiology last week.
It's the latest move in the race to provide widespread 5G coverage in New Zealand.
They've won exclusive access to a 5G testing lab - and a major advantage over their international competitors.
Fewer than a quarter of New Zealanders are confident they know enough about 5G.
People seem to only report ill-effects from cellphone towers if they already believe they're harmful.
Research shows 5G could be worth as much as $8.9 billion a year to the New Zealand economy.