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Tarkan
22 March 2026
If you are heading to Europe on an O2 plan, you are in a better position than most UK travellers. O2 is the only major UK carrier that still includes free EU roaming on all plans, while EE, Vodafone, and Three have all reintroduced daily charges since Brexit. You can use your UK data, calls, and texts across 48 European destinations at no extra cost. That said, free does not mean unlimited. O2 applies a 25 GB fair use cap on roaming data, certain popular destinations like Turkey and Morocco sit outside the Europe Zone entirely, and the Travel Bolt On for non-EU countries comes with a 2 Mbps speed restriction. This guide breaks down what O2 EU roaming actually includes, where the limits kick in, and when pairing your O2 plan with a travel eSIM gives you a better deal.
O2 includes free EU roaming on all Pay Monthly and Pay As You Go plans. When you land in any of the 48 destinations within O2's Europe Zone, your UK allowance of data, calls, and texts applies at domestic rates. No daily charge, no travel pass, no activation needed. Just enable data roaming in your phone settings and your plan works as if you were still in the UK.
This is a notable advantage over other UK carriers. Since Brexit removed the legal obligation for free EU roaming, EE reintroduced a daily charge of £2.47 (or £2.59 on older plans), Vodafone charges £2.42 to £2.57 per day depending on the plan, and Three charges £2 per day on Value plans. O2 remains the only major UK network that has not brought back EU roaming fees, a distinction it has held since 2021.
O2's Europe Zone covers all EU member states plus Iceland, Liechtenstein, Norway, Switzerland, Monaco, and several overseas territories like the Azores, Canary Islands, and French Guiana. The full list runs to 48 destinations. However, Turkey, Morocco, Albania, Serbia, Montenegro, Kosovo, Bosnia, and North Macedonia are not part of O2's Europe Zone. For those destinations, you need either the Travel Bolt On at £7 per day or an Ultimate Plan with Travel Inclusive Zone coverage.
There is a 25 GB fair usage cap on data roaming within the Europe Zone. If your UK plan includes more than 25 GB, your roaming allowance is capped at 25 GB. If your plan includes less than 25 GB, your full UK allowance applies. Exceeding the cap triggers overage charges of £3.50 per GB. O2 sends a text notification as you approach the limit and again when you reach it.
O2's free EU roaming activates automatically. No text codes, no app toggles, no passes to buy. For destinations outside the Europe Zone, the Travel Bolt On at £7 per day covers countries like the USA, Australia, Dubai, Turkey, and Thailand. Text TRAVEL to 23336 to add it before you depart. All O2 roaming outside the EU comes with a 2 Mbps speed cap, which is fast enough for messaging and email but noticeably slow for video calls or streaming.
Customers on Plus Plans get the Travel Inclusive Zone covering 27 non-EU destinations at no extra cost with unlimited data (capped at 2 Mbps). Those on Ultimate Plans get the Travel Inclusive Zone Ultimate, which expands coverage to 75 destinations outside Europe, including Turkey, the UAE, Thailand, Japan, and over 20 Caribbean islands. Check current plan eligibility on the O2 website or the My O2 app, as not all tariffs qualify for every tier.
Enable data roaming before you board your flight. O2 EU roaming will not work if data roaming is toggled off in your phone settings. On iPhone, go to Settings, then Cellular, then Cellular Data Options, and switch on Data Roaming. On Android, the path is Settings, then Connections, then Mobile Networks, then Data Roaming. Most modern eSIM compatible devices including the iPhone 17 and Galaxy S26 support this toggle in the same location.
Monitor your usage against the 25 GB cap. Track data consumption through the My O2 app. O2 sends a text as you approach the limit, but checking proactively is smarter. A two-week holiday with regular navigation, social media, and occasional video calls can easily consume 10 to 15 GB. Longer trips or families sharing a hotspot will approach the cap faster.
Know which countries sit outside the Europe Zone. Turkey, Morocco, Albania, Montenegro, North Macedonia, Serbia, Kosovo, Bosnia and Herzegovina, and Northern Cyprus are all excluded from free O2 EU roaming. These are popular UK holiday destinations, and travellers often assume they are covered.
Understand the 2 Mbps speed cap outside Europe. The speed restriction applies to the Travel Bolt On, Travel Inclusive Zone, and Travel Inclusive Zone Ultimate. Within the EU, there is no speed cap. 2 Mbps handles WhatsApp, email, and basic browsing without trouble, but video calls stutter and streaming services buffer frequently at that speed.
Check Balkans coverage carefully. Croatia is included in O2's Europe Zone. Serbia, Montenegro, Kosovo, Albania, Bosnia, and North Macedonia are not. If your trip crosses borders in the region, you may move in and out of coverage without realising it. A travel eSIM for the non-EU segments avoids surprise charges.
Combine O2 EU roaming with a travel eSIM for multi-stop trips. Use O2's free EU roaming while in France, Spain, or Italy, then switch to a TurkSIM eSIM when you cross into Turkey or Morocco. On any Dual SIM phone, both lines run simultaneously. Keep O2 active for calls and texts, use the eSIM for data where O2 charges extra.
For trips staying entirely within O2's Europe Zone, the free roaming is genuinely hard to beat. No UK carrier offers a better EU roaming deal. But the picture changes as soon as your trip extends beyond the 48 included destinations or your data needs exceed what O2 provides.
For non-EU destinations, the Travel Bolt On at £7 per day adds up quickly. A 10-day trip to Turkey costs £70 in roaming fees alone. Two weeks in Dubai runs to £98. If you are not on a Plus or Ultimate Plan, these are unavoidable costs for using your phone outside Europe. A prepaid Turkey eSIM or UAE eSIM typically covers the same period for a fraction of the cost, with 4G/LTE speeds on local networks instead of O2's 2 Mbps cap.
For heavy data users approaching the 25 GB cap on longer European trips, a travel eSIM supplements O2's free allowance. Rather than paying £3.50 per GB after exceeding the cap, add a prepaid Europe eSIM as a secondary data line. This is particularly relevant for remote workers who need reliable video conferencing or travellers who stream content regularly.
For multi-destination trips crossing EU and non-EU borders, the maths clearly favours a travel eSIM for the non-EU segments. A Greece-to-Turkey trip, a Spain-to-Morocco ferry crossing, or a Balkans road trip through Croatia into Serbia and Montenegro all create situations where O2's free roaming cuts out mid-journey. Having a TurkSIM eSIM ready for those segments means uninterrupted connectivity without daily charges.
O2's free EU roaming is one of the strongest offerings among UK carriers, and for trips within Europe there is little reason to look elsewhere. The value gap opens up outside the Europe Zone. The Travel Bolt On charges £7 per day with a 2 Mbps speed cap, which means a week in the USA costs £49 for throttled data. The Travel Inclusive Zone tiers solve this for Plus and Ultimate customers, but those plans come at a premium monthly cost that only makes sense if you travel frequently.
TurkSIM eSIMs connect to top local carriers in each destination. In Turkey, that means Turkcell and Türk Telekom. In the USA, it is AT&T, Verizon, and T-Mobile. In Japan, NTT Docomo. In the UAE, Etisalat and du. Each connection runs at full 4G/LTE speed on the local network, not capped at 2 Mbps. The eSIM activates before departure by scanning a QR code, and the prepaid model means you pay once for the data you need with no rolling daily charges.
The Dual SIM setup is particularly useful for O2 customers. Keep your O2 line active for UK calls, texts, and banking verification codes. Use the TurkSIM eSIM as your data line in non-EU destinations. Both lines run on the same phone simultaneously. Any eSIM-compatible device supports this, from the iPhone 17 series back to the iPhone XS, and from the Galaxy S26 back to the Galaxy S20. Check the full list of eSIM compatible devices if you are unsure about your handset. For step-by-step setup, see the eSIM installation guide.
No. O2 includes free EU roaming on all Pay Monthly and Pay As You Go plans. Your UK data, calls, and texts work across 48 European destinations at no extra cost, subject to a 25 GB fair use data cap. O2 is currently the only major UK carrier that has not reintroduced EU roaming charges since Brexit.
O2 applies a 25 GB fair usage cap on data roaming within its Europe Zone. If your UK plan includes less than 25 GB, your full allowance applies while roaming. If your plan includes more than 25 GB, your roaming data is capped at 25 GB. After exceeding the limit, O2 charges £3.50 per GB.
No. Turkey is not part of O2's Europe Zone and is not covered by the free EU roaming benefit. To use your O2 plan in Turkey, you need either the Travel Bolt On at £7 per day, an Ultimate Plan with Travel Inclusive Zone Ultimate, or a prepaid eSIM for Turkey as an alternative.
O2 applies a 2 Mbps speed restriction on all roaming outside its Europe Zone. This affects the Travel Bolt On, Travel Inclusive Zone, and Travel Inclusive Zone Ultimate. Within the EU, there is no speed cap. 2 Mbps is adequate for messaging, email, and basic browsing, but video streaming and video calls will experience buffering and quality drops.
Yes. On any Dual SIM phone, you can keep your O2 line active for calls and texts while using a TurkSIM eSIM as your data line. This is especially useful for non-EU destinations where O2 charges £7 per day, as the eSIM provides prepaid data at local rates without daily fees. The setup takes a few minutes and both lines operate simultaneously.
Turkey, Morocco, Albania, Montenegro, North Macedonia, Serbia, Kosovo, Bosnia and Herzegovina, and Northern Cyprus are not part of O2's Europe Zone. These are classified under different roaming zones with separate charges. Croatia is included in the Europe Zone, but neighbouring Balkan countries are not, which catches some travellers off guard on regional trips.
O2 sends a text notification as you approach the 25 GB cap and another when you reach it. After exceeding the limit, additional data is charged at £3.50 per GB. You can also purchase a Data Bolt On through the My O2 app to continue using data without the per-GB surcharge. Alternatively, adding a travel eSIM as a second data line avoids the overage charges entirely.
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