For a decade, the Commission has been working to reduce the surcharges that telecoms operators imposed on their customers each time they crossed a border while using their mobile device on holiday or during business trips. Since 2007, roaming prices have decreased by more than 90%. In 2015, the European Parliament and the Council agreed to end roaming surcharges for people who travel periodically in the EU. "Roam like at Home" - where customers pay domestic prices, irrespective of where they are traveling in the EU - became a reality for all European travellers on 15 June 2017.
For more information click https://ec.europa.eu/digital-single-market/en/faq/frequently-asked-questions-roam-home