EE, Vodafone, O2 and Three: Europe Roaming vs a French eSIM

What UK Roaming Buys You in Europe, and What It Cannot

If you are on EE, Vodafone, O2 or Three and heading to France, the roaming question usually gets framed as a price question: how much a day, how many gigabytes, is it cheaper to buy something else. That framing is comfortable because it has a tidy answer. It is also the wrong question, and it is the reason so many people arrive in Paris having solved the cheap part of the problem and none of the expensive part.

Roaming does one thing very well. It keeps your phone working on your existing UK number. That is genuinely useful, and for a weekend in Lille it may be all you need. But your existing UK number is a +44 number, and a +44 number is the specific thing that stops working properly the moment anyone in France needs to reach you. Not your data. Not your maps. The number.

TL;DR

O2 is the outlier: Europe Zone roaming is included in the tariff, capped at 25GB. Three charges £2 or £2.75 a day depending on when you joined, with a 12GB fair-use ceiling. EE’s pay as you go rate is £2.50 a day. Vodafone sells European roaming as passes, £16 for eight days or £21 for fifteen. None of that is ruinous for a short trip.

What none of them change is the number. A +44 number does not get called back by French restaurants, agencies, sellers or drivers, and French short codes cannot route to it at all. A French eSIM with a real +33 number runs alongside your UK line on the same handset, from about €19.90. The sensible setup is both, not either.

What EE, Vodafone, O2 and Three Charge to Roam in Europe in 2026

The four networks have drifted apart since EU roaming protections lapsed for UK customers. They now use genuinely different models, so the right comparison depends on which one you are on and, irritatingly, when you signed up.

O2 is the genuine standout. Europe Zone roaming is part of the tariff across more than 45 destinations, with no daily fee at all. Three’s Go Roam in Europe daily charge is £2 if you joined or upgraded between 1 October 2021 and 17 December 2025, and £2.75 if you joined on or after 18 December 2025. EE’s pay as you go customers opt into Roam like Home at £2.50 for 24 hours or £10 for seven days; decline it without an active plan and you are into 70p a minute, 30p a text and £3 per 500MB. Vodafone sells European roaming as passes rather than a flat daily fee, at £16 for eight days and £21 for fifteen, with Zone A included on all pay monthly plans.

The Daily Rate Is Not Where This Gets Expensive

Run the numbers on a fortnight in France and the spread is narrower than the marketing suggests. Three at £2 a day is £28. EE’s weekly add-on twice over is £20. Vodafone’s fifteen-day pass is £21. O2 is nothing. Against the cost of the trip itself, the gap between best and worst here is a couple of restaurant coffees.

So if roaming is nearly free on O2 and about £25 everywhere else, why does anyone bother with anything else? Because all four options deliver the same thing, and that thing has a flaw that no amount of included gigabytes repairs.

What a +44 Number Cannot Do Once You Land

Roaming is a connectivity product. It keeps your handset online and your UK number live. It does not give you a presence in the country you are standing in, and in France that distinction has teeth.

Start with the behaviour, because it is the part nobody warns you about. French businesses do not call back foreign numbers. A restaurant taking a booking, a gîte owner confirming your arrival window, an agency handling a short let, a courier trying to find your building, a marketplace seller arranging a handover: given a +33 number they ring it, and given a +44 number they very often do not bother. This is not a policy anyone has written down. It is simply what happens, and it is consistent enough that travellers who rely on being phoned back learn it the hard way. Having a french number that works on arrival removes the friction entirely, because you stop being an international call and start being a local one.

Then there is the technical half. French SMS short codes, the five and six digit senders that services use for confirmations and one-time passwords, are scoped to the French numbering plan. They do not route internationally. This produces the most frustrating failure mode in travel: a signup that accepts your +44 number without complaint, and a verification code that then never arrives. Nothing is broken and nothing tells you what went wrong. The message simply had nowhere to go.

A roaming +44 number is also, quietly, a signal. It tells everyone who sees it that you are not here, which changes how quickly people reply to you and whether they treat your enquiry as real.

Where This Actually Bites on a Trip

The pattern is always the same: the problem appears after the sign-up, not during it. Car hire desks ring ahead when a flight slips. Delivery drivers phone from the pavement because the building code did not work. Restaurant staff call to move a table by half an hour. Short-let hosts confirm key collection by text. Every one of those is an inbound call or SMS from a French number to yours, and every one of them degrades when yours starts +44.

The same logic applies to the local apps that make a French trip easy: ride-hailing, scooter hire, transport ticketing, parking, delivery. They lean on SMS confirmation and driver callbacks, and they assume a local line. If you want to compare the plans built for this, france esims with a number reviewed covers what each one includes. Keep your bank on your UK number where it belongs, and use the French line for the ordinary day to day verification and booking traffic.

The Fair-Use Caps Nobody Mentions Up Front

Worth knowing before you rely on roaming for a longer stay: your UK allowance does not travel intact.

Three applies a 12GB ceiling on pay monthly plans in any Go Roam destination, which is the tightest of the four and well under what most people now hold domestically. O2 and Vodafone both cap roaming at 25GB where your UK allowance exceeds it. O2’s roaming fair usage policy also sets a hard limit on duration: more than 63 days outside the UK in any four-month period counts as unfair use, after which surcharges of £3.50 per GB, 3.3p a minute and 1p a text apply.

There is a subtler one on Three. Go Roam covers calls and texts to UK numbers and to numbers in other Go Roam destinations, but not calls or texts to international numbers. Dialling outside that set from France is chargeable, which catches people who assume roaming means everything works as it does at home.

What a French eSIM Costs Alongside It

A French eSIM is not a replacement for your UK line. It installs as a second profile on the same phone, so both numbers are live at once and your UK number keeps ringing.

Two things stand out against the roaming figures. The first is that a fortnight of Three or Vodafone roaming costs roughly what a thirty-day French line with a real number costs outright. The second is the fair-use comparison: Three’s 12GB ceiling sits against 100GB on a €25 french phone number plan, which reframes what the roaming charge is actually buying.

One honest limitation. The +33 number is yours for the life of the plan and is released when the plan ends. It is built for trip-length use and one-off verification, not as a permanent contact point. Anything you will need after you fly home – booking references, receipts, confirmations – should go to your email address as well as your phone.

The Setup Most People Actually Want

Not roaming or eSIM. Both, on one handset.

Leave your UK line active and set it to receive calls and texts, so your bank, your family and anyone holding your usual number still reaches you. Add the French eSIM as the second line and set it as your data line and as the number you hand out in France. Bookings, deliveries, local apps, sellers, agencies and drivers all get a +33 number that they will actually dial. Your UK number becomes the line you receive on rather than the line you advertise.

On O2 this is especially easy, because roaming costs you nothing and the French line is purely additive. On Three or Vodafone you can often skip the daily charge or the pass altogether by letting the eSIM carry the data and keeping the UK line for inbound calls only.

When Roaming on Its Own Is Fine

Three cases. A trip of two or three days where nobody needs to call you back. An O2 customer on a short break who will stay well inside 25GB. And a business traveller whose colleagues and clients are all in the UK and who has no reason to interact with a French service at all.

Outside those, the moment a French person, business or platform needs to reach you, the roaming plan stops helping and the number starts mattering.

Setting It Up Before You Fly

Check your handset supports eSIM, which most phones sold since 2019 do. Buy before you travel and install the profile at home over Wi-Fi; the plan clock does not start until the eSIM connects to a network in Europe. Set your UK line to receive calls and texts and the French line to carry data. Then give out the +33 number for anything French: reservations, deliveries, hire desks, app signups.

The Verdict for 2026

On pure cost, O2 wins on roaming and it is not close. Three and EE are cheap enough that the daily charge is not what should decide your trip, and Vodafone’s passes are competitive if the dates line up.

But cost was never the interesting part of this comparison. Every one of the four leaves you holding a +44 number in a country that does not call +44 numbers back and cannot deliver its own verification codes to them. That is not a problem you can buy your way out of with more gigabytes. It is a problem you solve by carrying a French number as well – which, at the price of a fortnight’s roaming, is a straightforward trade.

Frequently Asked Questions

How much do EE, Vodafone, O2 and Three charge to roam in Europe?

O2 includes Europe Zone roaming in the tariff with a 25GB limit. Three charges £2 a day if you joined or upgraded between 1 October 2021 and 17 December 2025, or £2.75 a day if you joined on or after 18 December 2025. EE pay as you go customers pay £2.50 for 24 hours or £10 for seven days. Vodafone sells European roaming as passes at £16 for eight days and £21 for fifteen.

Which UK network is cheapest for roaming in Europe?

O2, because Europe Zone roaming is included in the tariff at no daily charge across more than 45 destinations, subject to a 25GB roaming limit and a fair-use rule of 63 days abroad in any four-month period.

Why does my UK number still cause problems in France if roaming works?

Roaming keeps your +44 number live, but French businesses generally do not call foreign numbers back, and French SMS short codes are scoped to the French numbering plan so they do not route internationally. A signup can accept a +44 number and the confirmation code still never arrives.

Can I keep my UK number active while using a French eSIM?

Yes. A French eSIM installs as a second line on the same handset, so your UK number stays live for incoming calls and texts while the French +33 number handles local calls, bookings and app verification codes.

What are the fair-use data caps on UK roaming in Europe?

Three applies a 12GB ceiling on pay monthly plans in Go Roam destinations. O2 and Vodafone both cap roaming at 25GB where your UK allowance is larger. O2 also treats more than 63 days outside the UK in any four-month period as unfair use, after which surcharges apply.

Is a French eSIM cheaper than UK carrier roaming?

For a fortnight they are close. Two weeks of Three at £2 a day is about £28 and Vodafone’s fifteen-day pass is £21, while a thirty-day French plan with a real +33 number and unlimited calls and SMS starts around €22.90. The difference is what you get for it: the eSIM adds a local number, which roaming does not.