EU Mobile Roaming Charges Scrapped (bbc.com)

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 abroad should have gone. From a report: The new rules mean that citizens travelling within the EU will be able to call, text and browse the internet on mobile devices at the same price they pay at home. The European Commission said the end of roaming charges was one of the greatest successes of the EU. But a UK consumer group warned phone users could face "unexpected charges." Until now roaming, or connection, charges have been added to the cost of calls, texts and internet browsing when consumers from one EU country travelled to another and connected to a mobile network there.

Comments

Re:Watch out for Andorra-not an EU nation.

[Midnight Thunder]

Andorra is in Europa, but not in European Union.
same for Switzerland.

these roaming agreements are not applicable.

The continent is Europe, while Europa is a moon of Jupiter, though you are right when you say Andorra is not part of the EU.

There is an article 'The Independent' indicates, though the article describes some more of the 'gotchas':

The three non-EU countries in the European Economic Area — Iceland, Norway and plucky Liechtenstein — will introduce Roam Like at Home “shortly after 15 June”, according to Brussels.

Other key exclusions include Switzerland, Andorra, Serbia and Albania, as well as the Channel Islands and the Isle of Man. Some operators are applying the same basic European rules to those destinations, others are not; when travelling anywhere outside the EEA, you should check exactly what your operator plans to charge you.

The best solution is really to check with your operator and get things in writing.