Roam, and you pay your network's daily rate whether you use it or not. Buy a travel eSIM, and you pay for data. Which one stings less depends on your plan, your trip and your habits — so this works it out with your numbers instead of a stranger's.
Most networks reintroduced European charges on a specific date and left older contracts alone. Two people on the same network and the same tariff can pay different amounts depending on when they signed.
Premium plans often bundle roaming that cheaper plans charge for. Pay-as-you-go is usually a separate scheme again, with its own daily and weekly rates.
Networks split the world into zones, and the same trip can cost nothing, a couple of pounds a day, or seven, depending which zone your destination sits in. Ireland is frequently free when the rest of Europe isn't.
| Network | Europe | Fair-use cap | Beyond Europe |
|---|---|---|---|
| EE | Around £2.47–£2.59/day; monthly pass available | 50GB (25GB PAYG) | Zone-based passes |
| Vodafone | Around £2.42/day; Ireland, Iceland and Norway free | 25GB | Around £7.39/day |
| O2 | Included on most plans | 25GB | Around £7/day |
| Three | Go Roam, varies by plan | 12GB | Varies by plan |
| giffgaff, SMARTY, iD, Tesco, VOXI | Generally included | 5–30GB | Usually not included |
These are typical figures, not promises. Premium plans, older contracts and business tariffs all differ. Use step one above to check yours properly — it takes about two minutes and it's the difference between an estimate and an answer.
On daily-charge networks the fee lands the moment your phone touches a foreign mast. One glance at a map counts as a full day, and a stopover can cost you a day in a country you never left the airport of.
Every inclusive deal carries a fair-use cap. Past it you pay by the gigabyte at rates that make the daily-fee networks look kind. Know your cap before you start streaming.
Travel eSIMs sell data, not a number. If you need to take a call on your UK mobile, keep roaming switched on for calls and let the eSIM carry the data. Both at once is often the cheapest setup.
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