Getting home from a holiday to find a mobile bill you weren’t expecting is one of travel’s most avoidable frustrations. Yet it still catches millions of UK travellers off guard every year. Ofcom research found that nearly one in five (19%) holidaymakers didn’t realise they could face extra charges for using their phone abroad and a similar number admitted they never check before they go.
The rules around roaming have changed substantially since Brexit, and understanding what your network actually charges and what alternatives exist can save you a lot of money. This guide cuts through the confusion.
What is mobile roaming?
When your phone leaves the UK, it can no longer use your home network’s signal. Instead, it connects to a local mobile network in the country you’re visiting. That process is called roaming.
During roaming, your phone still works in much the same way, you can make calls, send texts and use data, but the costs are typically much higher than at home. Your UK network pays the foreign network a wholesale fee to carry your traffic, and passes some or all of that cost on to you.
Roaming applies to:
- Receiving calls while abroad (some networks charge for incoming calls too)
- Mobile data (browsing, streaming, maps, messaging apps)
- Outgoing calls to UK numbers or local numbers abroad
- Outgoing texts
⚠️ Data roaming is usually the biggest bill shock risk. A few hours of using maps, social media and messaging without a data package can generate charges of several pounds per megabyte on some networks.
How Brexit changed the roaming rules
Before the UK left the EU, a piece of legislation called ‘Roam Like at Home‘ meant UK travellers could use their normal calls, texts and data allowances in any EU country without paying a penny extra. It was one of the most popular practical benefits of EU membership.
That protection ended on 31 December 2020. Since then, UK mobile networks have been free to set their own rules and most of the major networks have taken the opportunity to reintroduce charges for EU travel.
EE was the first major UK network to bring back EU roaming charges in July 2021. Three and Vodafone both followed. As things stand in 2026:
- O2 is the only major UK network that still offers free EU roaming for most of its customers (with a 25GB fair use cap)
- EE, Three and Vodafone all charge a daily fee to unlock your UK allowances in Europe
- Tesco Mobile has extended free EU roaming for its customers until 2026
- GiffGaff offers free EU roaming with a 5GB data limit
- iD Mobile (from the Three network) offers 30GB of roaming data
The situation outside Europe is even more expensive. Charges for the US, Canada, Asia and Australia vary widely and without a plan, some networks charge up to £7.75 per megabyte of data. That’s enough to run up a three-figure bill in an afternoon.
What UK networks charge: 2026 roaming rates
Roaming charges vary significantly between networks, and often between different tariffs on the same network, depending on when you signed up. The table below gives an overview of current daily charges for the major UK providers. Always check directly with your network before you travel, as rates are subject to change and your contract date can affect what you pay.
EU / Europe
| Network | Daily charge (Europe) | Countries covered | Notes |
|---|---|---|---|
| O2 | Free | 40+ EU destinations | 25GB fair use cap. 63-day limit per 4-month period. |
| EE | £2.47 / day | 47 countries | For customers who joined on/after 7 July 2021. Older contracts may still have free roaming. |
| Three | £2.75 / day | 71 destinations | For contracts from 18 Dec 2025 onwards. Earlier contracts pay £2/day. |
| Vodafone | £2 / day | 48 destinations | Or £8 for an 8-day pass / £15 for 15 days. 25GB fair use cap. |
| Tesco Mobile | Free | 48 destinations | Free EU roaming extended until 2026. |
| GiffGaff | Free | EU destinations | 5GB data limit while roaming. |
| Sky Mobile | £2 / day | 55 destinations | Roaming Passport Plus pass. |
Outside Europe
| Network | Daily charge (rest of world) | Countries covered | Notes |
|---|---|---|---|
| EE | £5–£15 / day | Selected countries | USA, Canada, Mexico, Australia, NZ included with Roam Abroad add-on (£10/month or £25/month). |
| Three | £8 / day | Go Roam Around the World | 160+ destinations. From April 2026. |
| Vodafone | £7.39 / day | 107 countries | Outside Europe in Zones C & D. |
| O2 | Varies | 63 destinations | O2 Travel covers selected destinations outside Europe. |
⚠️ Daily roaming charges run midnight to midnight UK time, not from when you first use your phone. If you arrive late at night and make one call, you could be charged a full day’s fee. The same applies when you return home, any use after midnight will trigger another day’s charge.
The Ofcom rules that protect you
From 1 October 2024, new rules introduced by Ofcom, the UK’s telecoms regulator, came into force. These require all UK mobile providers to give customers clearer information about roaming costs and better tools to control their spending.
Under the new rules, your network must:
- Send you an automatic text alert as soon as you start roaming, detailing the charges that apply
- Tell you about any fair use limits or time-limited allowances
- Give you clear information on how to set a spend cap
- Alert you when you’re at risk of inadvertent roaming (more on that below)
Inadvertent roaming
Inadvertent roaming is a lesser-known problem. It happens when your phone picks up a signal from a foreign network even though you’re still physically in the UK. Ofcom research found that 14% of UK mobile customers have experienced this and for people in Northern Ireland, where Irish network signals frequently cross the border, that figure rises to 22%.
Inadvertent roaming can even happen on the south coast of England, where phones occasionally connect to French networks. Under Ofcom’s new rules, providers must now alert customers if this happens and have measures in place to limit any unexpected charges.
Spend caps
The previous EU-era rule requiring providers to apply an automatic spending cap of around £45 is no longer legally required post-Brexit. However, most major networks have retained similar voluntary protections. It’s still wise to set your own spend cap directly through your network’s app or website before you travel, and to check that adding a roaming add-on doesn’t inadvertently remove your existing cap.
How to avoid roaming charges
There’s no single answer that works for everyone, the right approach depends on where you’re going, how long for, and how heavily you rely on your phone. Here are the main options:
1. Check your contract before you travel
This sounds obvious, but it’s where most people go wrong. Your current contract date matters enormously, older EE or Three contracts may still include free EU roaming, for example. Log into your account or ring your provider before you go.
2. Buy a roaming add-on
Most networks offer add-ons or passes that bundle data, calls and texts for a set daily or weekly fee. If you’re a moderate user, these can be worth it. Just watch the midnight-to-midnight charging window, and confirm whether your add-on removes your existing spend cap.
3. Use Wi-Fi wherever possible
Hotels, cafes, restaurants and many public spaces offer free Wi-Fi. If you’re mostly using your phone in these environments, simply turn off mobile data and rely on Wi-Fi for messaging apps, maps and browsing. Just download your maps offline before you go.
✅ Download Google Maps or Maps.me for your destination before you leave the UK. Offline maps use no mobile data and can save you from getting lost, and racking up charges, when you need directions most.
4. Buy a local SIM card
For longer trips, buying a local prepaid SIM card at the airport or from a high-street phone shop can be significantly cheaper than paying daily roaming rates. You’ll need an unlocked phone and you’ll have a different number while you’re away, but if you mostly communicate via WhatsApp or iMessage, that’s rarely a problem.
5. Use a travel eSIM
The most convenient option for most modern travellers, and increasingly, the most cost-effective. We cover eSIMs in detail below.
What is an eSIM and how does it work?
An eSIM (embedded SIM) is a digital SIM card built directly into your phone. Unlike a physical SIM that you swap in and out, an eSIM is activated electronically, usually by scanning a QR code or downloading a profile through an app.
The practical advantage for travellers is significant. You can purchase a local data plan for your destination before you leave home, activate it when you land, and stay connected, all without touching your physical SIM card or visiting a shop. Your UK number remains active for calls and texts, while the eSIM handles your data abroad.
Which phones support eSIM?
eSIM support is now standard across most modern smartphones. To check whether your device is compatible:
- iPhone: Go to Settings > Mobile Data > Add eSIM. If the option appears, your phone supports it.
- Android: Go to Settings > Connections > SIM Manager. Look for ‘Add eSIM’ or ‘Add mobile plan’.
- Most iPhones from iPhone XS (2018) onwards support eSIM. The iPhone 16 range is eSIM-only in the US.
- Samsung Galaxy S20 onwards, Google Pixel 3 onwards, and most recent flagship Android devices support eSIM.
Some budget Android phones still don’t support eSIM. If you’re unsure, search for your exact phone model and ‘eSIM support’, the manufacturer’s website will confirm it.
How to set up a travel eSIM
The process typically takes under five minutes:
- Choose a travel eSIM provider and select the destination and data plan you need.
- Purchase online. A QR code is sent to you instantly by email or displayed in the provider’s app.
- Scan the QR code in your phone’s SIM settings to download the eSIM profile.
- Enable data roaming. Most eSIMs activate automatically once you arrive at your destination.
- Your UK SIM stays active for calls and texts. The eSIM handles your data.
✅ Set up your eSIM before you travel. It takes a few minutes and means you’re connected the moment you land, no hunting for airport SIM kiosks or waiting for slow Wi-Fi.
eSIM vs roaming: the real cost comparison
The cost difference between your network’s roaming rates and a travel eSIM can be substantial. Here’s a side-by-side comparison for a common scenario: a one-week holiday to the US.
| Scenario | Cost for 7 days (USA) | Data included |
|---|---|---|
| EE daily roaming (Zone) | From £70 (£10/day) | UK allowance (fair use limits apply) |
| Three Go Roam World (new contract) | £56 (£8/day from April 2026) | Up to 12GB |
| Vodafone daily charge | £51.73 (£7.39/day) | Up to 25GB (fair use) |
| Travel eSIM (e.g. Airalo, 5GB) | Approx. £8–£12 | 5GB data |
| Travel eSIM (e.g. Holafly, unlimited) | Approx. £22–£30 | Unlimited (some throttling after heavy use) |
For most holiday use, maps, messaging, social media, the odd search, 5GB to 10GB is more than enough for a week abroad. At those data volumes, a travel eSIM typically costs a fraction of the equivalent roaming charge.
The main trade-off is that most travel eSIMs are data-only. You won’t get a local phone number for calls and SMS texts. However, if you’re communicating via WhatsApp, iMessage or FaceTime, which the majority of UK travellers are, this rarely matters in practice.
The one area where your network roaming add-on may win out is if you need to make a significant number of voice calls to local numbers in your destination country. In that case, compare carefully before committing to either option.
What to look for in a travel eSIM provider
The travel eSIM market has grown rapidly and there are now dozens of providers to choose from. Here are the factors worth comparing:
| Factor | Why it matters |
|---|---|
| Network partner(s) | eSIM providers rent signal from local networks. In the UK, EE is typically fastest; in most countries, multi-network eSIMs offer better coverage as your phone can switch if one network is congested. |
| Data allowance vs. unlimited | Unlimited plans cost more but remove any anxiety about running out. For a week’s holiday, 5–10GB is usually sufficient. For a longer trip or heavy streaming, unlimited may be worth it. |
| Fair use throttling | Some ‘unlimited’ plans throttle speeds after a certain amount of data (commonly 1–5GB of hotspot use). Read the fair use policy before buying. |
| Hotspot / tethering | If you want to share your connection with a laptop or travel companion, check that the plan allows it. Some unlimited providers restrict or cap hotspot sharing. |
| Validity period | Plans typically run from the point of first activation, not purchase. Check the validity period matches your trip length. |
| Customer support | If your eSIM fails to activate abroad, responsive support matters. Look for providers with 24/7 live chat. |
| Ease of top-up | Can you add more data easily if you run out? Good providers allow in-app top-ups without needing to install a new profile. |
✅ Use the Travel City eSIM comparison tool to search and compare plans from leading providers for your specific destination, trip length and data needs, side by side, with real pricing.
Frequently asked questions
Do I need to turn roaming on?
Yes. By default, data roaming is switched off on most phones. You need to enable it in your settings to use mobile data abroad. You do not need data roaming switched on to connect to Wi-Fi. For an eSIM, you’ll typically need to enable data roaming within the eSIM’s settings profile.
Can I be charged for receiving calls while abroad?
It depends on your network and contract. Some providers do charge for receiving calls while roaming, typically under a pay-as-you-go rate if you’re not on a daily roaming pass. If you’re worried about unexpected charges from incoming calls, divert your number to voicemail while abroad and check your voicemail over Wi-Fi.
What happens if I go over my data allowance?
If you exhaust the data included in your roaming plan, your network will either cut off your data (if you’ve set a spend cap) or start charging you at out-of-bundle rates, which can be very expensive. Most providers will send you a warning text before this happens. Setting a spend cap in your network’s app gives you an additional safety net.
Is an eSIM safe to use?
Yes. eSIM technology is the same as a physical SIM, it simply lives inside your phone rather than in a removable card. The profile is downloaded securely and your phone number is not affected. Your UK SIM and any eSIM profiles you’ve installed operate independently.
Can I use an eSIM and my UK SIM at the same time?
Yes, if your phone supports Dual SIM / Dual Standby (DSDS). Most modern flagship phones do. This means your UK number remains active for calls and texts while the eSIM provides your data connection abroad. You can set which SIM handles calls and which handles data in your phone’s settings.
What if I’m travelling to multiple countries?
Many travel eSIM providers offer regional plans, a single purchase that covers multiple countries. European plans, for example, typically cover 30+ countries under one data allowance. If you’re travelling across different regions on one trip, a global eSIM plan may be more cost-effective than buying individual country plans.
Will my network charge me if I accidentally roam near a border?
Potentially, yes, and this is more common than most people realise. Since October 2024, Ofcom rules require providers to alert you if this happens and to have measures in place to limit charges. If you live near the Northern Ireland border or frequently travel on cross-Channel ferries, it’s worth speaking to your network about how they handle inadvertent roaming.
Sources & data notes
UK network roaming rates sourced directly from EE, Three, Vodafone, O2, Sky Mobile and Tesco Mobile (April 2026). Ofcom research figures from Ofcom’s roaming consumer research, 2022 (sample: 2,108 UK adults). EU roaming cap data from European Commission. eSIM provider cost comparisons based on publicly available pricing at time of publication; prices subject to change.
