Here is a guide on how much texts, calls and internet browsing will now cost in the EU and how to avoid those high phone bills.
The European Union has capped the cost of making phone calls, texting or browsing the internet while abroad.
It should be no surprise that David Cameron failed to stop such a long-standing EU figure being nominated as European Commission president.
David Cameron's defeat over the appointment of Jean-Claude Juncker as the new head of the European Commission shows he will not be able to renegotiate the UK's relationship with the EU, Nigel Farage has insisted.
The Ukip leader said the EU leaders would rather see the UK leave than thrash out a substantial new deal.
"What I saw yesterday was the Prime Minister utterly humiliated, looking like a loser who had learnt nothing, still insisting, though it's rather more difficult, that he can renegotiate our position. He can't," Mr Farage told BBC Radio 4's Today programme.
Labour leader Ed Miliband pounced on David Cameron's defeat in Brussels, calling him a "toxic" prime minister.
UKIP leader Nigel Farage - whose success prompted the rethink on Europe - claimed the vote was pushing Britain closer to the EU exit door.
ITV News Political Correspondent Carl Dinnen reports:
David Cameron suffered a humiliating setback in Europe as he failed to block arch federalist Jean-Claude Juncker from getting the top job in Brussels, losing by 26 votes to 2.
However, the Prime Minister said sometimes you have to "lose a battle to win the war".
ITV News Europe Editor James Mates reports:
Jose Manuel Barroso, the current president of the European Commission, has congratulated Jean-Claude Juncker on being nominated as his successor in the key EU role:
David Cameron said his opposition to the nomination of Jean-Claude Juncker was "an important stand, but far from being the last stand" as he vowed to keep fighting for reform of the European Union.
David Cameron remained bullish despite his resounding failure in persuading EU leaders not to support Jean-Claude Juncker.
ITV News Europe Editor James Mates is at the Prime Minster's press conference in Brussels:
Cameron: This was an important stand, but far from being last stand. Sometimes have to be ready to lose a battle to win the war.
Cameron: The job of keeping UK in the EU has got harder. Is it an impossible job? No.
Cameron: In a Eur crying out for reform we've gone for THE career insider. But we have to work together now, so must put that rhetoric aside
David Cameron said the nomination of Jean-Claude Juncker as European Commission president represented "a bad day for Europe".
"This whole process has reinforced my view that Europe needs to change. If you are deadly serious that you want change, as I am, then you don't back down when a vote goes against you," the Prime Minister said.
"This is a bad day for Europe. It risks undermining the position of national governments and hands new power to the European Parliament."
David Cameron said it was "a serious mistake" that European Union leaders did not work together to find an alternative candidate to Jean-Claude Juncker as European Commission President.
The nomination of Jean-Claude Juncker as the next European Commission President represents an "abject failure of leadership" for David Cameron, said Labour’s Shadow Foreign Secretary Douglas Alexander:
– Douglas Alexander
The outcome of today’s summit represents an abject failure of leadership for David Cameron.
David Cameron’s basic errors of statecraft and diplomacy have let Britain down.
His excuses will fool nobody, least of all his own backbenchers.
Defeat for David Cameron was not inevitable. Yet it was predictable. Because for the past four years he’s been burning bridges with our European allies when he should have been building alliances.