Vodafone is denying its new 5G signal is so strong it's harmful to human health.
The company has launched the high-speed network in five cities, including Dublin.
However, there are concerns that 5G could cause long-term health problems.
5G signals can't travel as far as 4G signals, so more antennas and transmitters will be needed to carry them.
Critics of the technology fear that more infrastructure will mean more radiation is emitted, therefore affecting health.
However, the boss of Vodafone in Ireland has shrugged off that suggestion.
Anne O’Leary, CEO of Vodafone Ireland, said "there is no evidence of any adverse effects to health because of electromagnetic technology, which is mobile technology".
The company works with The World Health Organisation and other international health organisations to monitor the effects of its technology on users.
Ms O'Leary said Vodafone abides "by all the standards and rules".
"It's really just an evolution from 2G to 3G to 4G to 5G", she said.
Vodafone is introducing 5G to Dublin, Cork, Limerick, Galway and Waterford first.
Users will need a 5G ready plan, 5G coverage and a 5G phone to connect to the Vodafone 5G network.
Vodafone says its "game-changing" network will support many other new technologies - including artificial intelligence, the internet of things, connected cities and self-driving cars.