All 28 European Union countries are covered by these new rules, however, the "roam at home" rule only applies if you manage to stay within your contract.
New rules mean an end to the high roaming fees that some operators have been charging their customers when they were out of their home country.
EU "Roam Like at Home" is a win for Irish and European consumers whether on a business trip or on holidays. The European Commission said the termination of roaming charges is "true European success story".
For the moment however, calls in France will be much cheaper; so why not celebrate with that long phone call to the bank you've been putting off? Your mobile phone contract itself will probably go up as providers look to make up for their losses elsewhere.
The other members of the European Economic Area Iceland, Norway and Liechtenstein would join the group "shortly after June 15".
In turn, this has led to consumers being urged by watchdogs to check with their phone company about limits in the places they are set to visit, especially as eligible countries differ from provider to provider.
If you are on an unlimited internet deal, be sure to speak to your network about roaming as there may be fair use limits added in the future too.
From now on, European Union holidaymakers should return home without that sense of high anxiety about their mobile phone bill: extra fees for using it overseas should have gone.
Ian MacLean, chief marketing officer of Metaswitch, a UK-based company that develops, manufactures, and markets telecommunications software, commented that the ruling would impact operators' revenue by hundreds of millions of pounds a year. Sneaky networks may capitalize on the ignorance of some users by increasing roaming charges in those countries to make up for having to reduce them in others.
"Roaming charges will now be a thing of the past", continued Juncker.
In January, culture minister Matt Hancock reassured consumers that they would get a period of free regulated roaming before Brexit.
Alex Neill, Which? managing director of Home Products and Services, said: "Many will reap the benefits of these changes and will no longer be put off from making calls overseas". And if you are, make sure that some idiots in charge of your country haven't started to take your country out of the European Union, because when that happens you'll be utterly scuppered!
Many have criticised commission officials and Irish politicians for their failure to highlight this loophole, leading to fears that many Irish holiday makers will be hit with huge bills upon their return after they were led to believe they could "roam like home".
But when the United Kingdom leaves the European Union, it is likely to leave this rule behind.