Is this an EE Pay Monthly eSIM being used medium-to-long term, or is it a Travel eSIM for UK Visitors and Tourists?
If it is a regular Pay Monthly plan, then these can be used on networks in the Republic of Ireland free-of-charge as if you were in the UK.
However with the Travel eSIMs, these are for UK use only and likely would not provide the ability to connect to any other network than EE.
Important to note (particular for visitors) that the EE network will be available in Northern Ireland (part of the UK), but not in the Republic of Ireland (over the border).
