What are the roaming cost implications for UK (Post-Brexit) or US SIM card users in Ireland compared to DataESIM?

For travelers with UK (Post-Brexit) or US SIM cards in the Republic of Ireland, roaming costs can be a significant concern. Most UK carriers like O2, Vodafone, Three, and EE have reintroduced daily roaming fees, typically ranging from £2-£6. US and Canadian providers frequently charge high daily rates or per-MB fees. DataESIM offers transparent, high-data plans specifically for Ireland, providing predictable costs without hidden surcharges. This allows heavy data users and remote workers to maintain high-speed connectivity for their multi-week stays without worrying about escalating roaming bills.