Providing telecommunication services, including mobile phone and broadband services, is a matter for the relevant service providers operating in a fully liberalised market regulated by the Commission for Communication Regulation (ComReg), as independent regulator. All telecommunications operators are obliged to make customers aware of any roaming charges they could incur, if and when, they use mobile devices outside of the EU. ComReg regulates and monitors compliance in the area of roaming alerts to consumers to ensure that operators abide by these obligations.
A consumer may complain to a provider firstly and may subsequently bring the matter to ComReg's attention under their consumer complaints guide, see the following link: www.comreg.ie/media/2021/05/ComRegConnects_Complaints_Guide_En.pdf ComReg also has information for consumers in relation to roaming on their website (www.comreg.ie/consumer-information/roaming), including tips on how to avoid inadvertent roaming.