If your plan is European, check before you buy anything
Roam like at home covers the twenty seven EU states plus Iceland, Liechtenstein and Norway. A Spanish contract works in Estonia at Spanish prices. A German one works in Portugal at German prices. There is no eSIM on the market that improves on free.
The catch is the fair use policy buried in your contract. Operators are allowed to apply a volume cap on roaming for unlimited domestic plans, and they are allowed to challenge anyone who spends more time abroad than at home over a four month window. If you are moving for a summer rather than a fortnight, read that clause before you rely on it.
British plans are the exception that catches people out most often. After Brexit, EU roaming stopped being a legal right for UK customers, and most large UK operators reinstated daily charges. If your plan is British, treat Europe as a paid destination until you have checked your own tariff.
The European countries that are not in the roaming zone
Switzerland sits in the middle of the continent and outside the agreement. So do Turkey, Albania, Serbia, Bosnia and Herzegovina, North Macedonia and Montenegro. Your inclusive allowance stops at those borders and the per megabyte rate behind it is the one that produces the stories about four figure phone bills.
This is where a travel eSIM earns its place, and it is why the highest demand we measure on this continent is not for France or Italy but for Switzerland, Turkey and Albania. A rail trip from Munich to Zagreb that dips through Switzerland is not one roaming zone, it is two.
When a regional plan beats a country plan
A regional plan is worth the premium when you will genuinely use it in three or more countries and you do not want to think about switching. Interrail routes, a work trip with four airports, a driving holiday through the Balkans. One profile, one installation, no decisions at the border.
It is the wrong buy for a single city break. A country plan is cheaper per gigabyte almost every time, and a week in Lisbon does not need the flexibility you are paying for.
How to decide in under a minute
Start with your own contract. If it is EU or EEA and your trip stays inside the bloc, close this page and enjoy the free roaming. If your plan is British, Swiss, American or anything else, price the trip properly before you fly.
Then look at your route rather than your destination. The question is not which country you are visiting, it is how many roaming zones you will cross. One zone means one country plan. Several means either a regional plan or the discipline to buy as you go.
Where are you going?
DestinationsCommon questions
Do I need a travel eSIM anywhere in Europe if I have an EU plan?
Not inside the EU, Iceland, Liechtenstein or Norway, where your home allowance applies by law. You do need one for Switzerland, Turkey, Albania, Serbia, Bosnia and Herzegovina, North Macedonia and Montenegro, none of which are covered.
Why is Switzerland so often the reason people buy?
Because it is surrounded by the roaming zone without being in it. Travellers cross into it by train or car without registering that anything has changed, and the tariff behind the border is charged per megabyte.
Has anything changed for UK travellers since Brexit?
Yes. Inclusive EU roaming is no longer a legal entitlement for UK customers and most major operators have brought back daily fees. Check your own tariff rather than assuming the old rules still hold.
Is a Europe wide plan better value than buying per country?
Only above roughly three countries. Below that, a country plan almost always costs less per gigabyte, and the convenience you are paying for has nothing to do.