Residents of the European Union no longer have to pay roaming fees when traveling to another EU member country… with a few exceptions.
Carriers can still charge you fees if you go over a data limit, but the fees are capped at a much lower rate than they used to be. And if you spend more time abroad than you do in our home country over a 4-month period, you carrier may charge you extra.
Some budget wireless carriers also have permission to charge a small amount in roaming fees.
Note that the new rules do not apply to travelers visiting an EU member country from a non-member nation. So, depending on your wireless carrier, you may still be better off buying a new SIM card when traveling from the US to Europe.
Travelers from the United Kingdom can still benefit… at least until Brexit is complete. Overall, the new Roam Like at Home rules affect residents of 28 countries.