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Part of a nationwide day of protest against 5G network installation, the group was calling for more public consultation and more research before the new technology is used.
5G is the latest cellphone technology, with higher speeds than the decade-old 4G technology.
Questioning 5G Dunedin co-ordinator Christopher Le Breton said the group was expressing concerns about the health and privacy of those across the world.
"We’re not protesting, we’re questioning."
He said he had heard from Queenstown residents — where limited-capacity 5G mobile coverage had been rolled out — who were experiencing health problems such as nosebleeds and headaches.
"There is enough research out there to indicate there is a problem and New Zealand policy looks to a compromised agency for its research."
Mr Le Brenton said the Dunedin City Council needed to take a precautionary approach and pause the rollout of 5G in Dunedin until independent research deemed it was safe.