You will not be able to use your phone when roaming in the EU, however you can roam outside the EU. You’ll be charged for all your calls and texts, and data usage is blocked outside Ireland. See here for the full list of rates.
I’ll need more than 3GB while in the EU. Can I buy extra data?
Yes, the 3GB data addon can be used in Ireland and in the EU if you’re on the Guido membership. See here for more.
What will the 300 minutes and unlimited texts on Guido cover in the EU?
You can use the 300 minutes and unlimited texts to call and text Ireland and the EU.
Or iPhone? Tap Reset Network Settings in the Settings app.
Does 48 have a roaming agreement with the country that you’re in? Check if it’s on this list.
Find out what frequency bands are used in the country you’re roaming in here, and then check that your phone uses the same frequency bands here.
If all of the above tells you that you should be able to connect to a particular network there, try manually selecting it in your phone settings.
If the above hasn’t helped you to connect, you can search the community to find others who have had the same issue, or start a new topic stating where you are, what phone you’re using and what is going wrong.