Is roaming free in Ireland for UK (Post-Brexit) or US SIM card holders with CoreESIM?

CoreESIM provides dedicated data connectivity for Ireland, distinct from traditional roaming. Regarding your existing SIM, the status depends on its origin. For UK travelers post-Brexit, most major UK carriers, including O2, Vodafone UK, Three UK, and EE, have reintroduced daily roaming charges for Ireland, typically ranging from £2 to £6 per day. For US, Canadian, or Asian travelers, roaming in Ireland is generally not free and is subject to your home carrier's international roaming packages or pay-per-use rates, which can be expensive. CoreESIM offers a transparent, pre-paid alternative.