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Tarkan
23 March 2026
Three is one of the UK's four major mobile carriers, and it offers international roaming in over 160 destinations. But since Brexit ended automatic free EU roaming for UK customers, and since Three overhauled its plan structure in June 2025, the roaming landscape has become significantly more complex. Between Value plans, Complete plans, Go Roam passes, Data Passports, and pay-as-you-go rates that vary by destination zone, figuring out what your Three plan actually includes abroad takes real effort. This guide unpacks every Three international roaming option, explains what changed with the June 2025 plan restructure, and shows you when a prepaid travel eSIM is the better choice.
Three's international roaming divides destinations into zones: Go Roam in Europe (49 European destinations), Go Roam Around the World (71 destinations including the US, Australia, and Turkey), and Go Roam Around the World Extra (destinations like Morocco and Dubai). Each zone has different pricing, pass options, and eligibility depending on your plan type and when you signed up.
The June 2025 restructure changed things significantly. Three replaced its older plan tiers with four new categories: Lite, Advanced, Value, and Complete. Only Value and Complete plans include built-in roaming. Lite and Advanced plans have no roaming included and require purchasing Go Roam passes or Data Passports for any international usage.
Value plans include up to 28 days of free roaming per year. Complete plans include up to 56 days. Both are subject to Three's Fair Use Policy, which caps data roaming at 12 GB per month, even if your UK plan includes more. This is a crucial detail: if you have a 100 GB UK plan, you can only use 12 GB of it while roaming.
Customers who started their plan before June 22, 2025 may have different roaming entitlements depending on their original plan terms. Check your specific plan details in the My3 app or contact Three directly to confirm what's included.
The costs vary by plan type, destination zone, and whether you have built-in roaming or need to purchase a pass.
The Go Roam passes are the main option for Lite and Advanced plan customers, and a useful top-up for Value/Complete customers who have used their free roaming days. Passes are purchased through the My3 app or website and activate on purchase.
Data Passport at £5/day is an interesting alternative. It provides unlimited data in 89 destinations, but only covers data. Voice calls and texts are charged at standard pay-as-you-go rates. For data-heavy travellers who primarily communicate through WhatsApp or other messaging apps, this can work well. But the £5/day for unlimited data is attractive only if you need more than what the Go Roam pass provides within the 12 GB cap.
A significant limitation for non-European destinations: tethering (hotspot) is not allowed outside Europe on Go Roam passes. If you need to share your phone's connection with a laptop, you'll need a Data Passport or a separate solution.
Check your plan type in My3. The difference between Lite, Advanced, Value, and Complete determines whether you have built-in roaming or need passes. Don't assume your plan includes roaming unless you've verified.
Track your free roaming days. Value (28 days) and Complete (56 days) plans have annual roaming allowances. Once you've used them, each additional roaming day triggers the standard daily charge. Monitor your usage in the My3 app to avoid surprises.
Respect the 12 GB Fair Use Policy. This is the hard ceiling on data roaming regardless of your UK data allowance. If you have unlimited data in the UK, you still only get 12 GB per month while roaming. Set a data usage alert in My3 to warn you before hitting the limit.
Understand tethering restrictions. Outside Europe, tethering (personal hotspot) is not included in Go Roam passes. If you need to connect a laptop, use hotel Wi-Fi, buy a Data Passport, or consider a travel eSIM that allows tethering.
Buy passes before arrival, not after. Go Roam passes activate on purchase. If you arrive in Bangkok without a pass and use your phone, you'll be charged the auto-triggered daily rate. Buy the pass before departure to be covered from the moment you land.
Use Data Passport selectively. At £5/day for unlimited data, Data Passport makes sense for days with heavy data needs (remote work days, navigation-intensive sightseeing). For lighter days, a Go Roam pass may be cheaper. Mix and match based on your actual daily usage.
Three's roaming structure has two major limitations that push travellers toward alternatives: the 12 GB Fair Use cap and the tethering restriction outside Europe.
The 12 GB cap means that no matter how generous your UK plan is, you're limited to 12 GB per month while roaming. For a two-week trip with active navigation, social media, video calls, and photo uploads, 12 GB can run out before the trip does. Once depleted, you're either paying top-up rates or going without data.
The tethering ban outside Europe makes Three roaming impractical for anyone who needs to connect a laptop. Remote workers, digital nomads, and business travellers who rely on mobile hotspot connectivity are effectively locked out of the standard Go Roam pass for non-European destinations.
A travel eSIM bypasses both limitations. You get a dedicated data pool with no fair use cap (the data you buy is the data you get), and most eSIM plans allow tethering without restrictions. The eSIM runs alongside your Three SIM in Dual SIM mode, keeping your UK number active for calls, texts, and banking codes while all data goes through the local network.
For European trips, Three's Go Roam passes are decent value (£2/day on Europe pass, or free on Value/Complete plans). But for worldwide destinations, particularly in Asia, the Middle East, and Africa, the combination of pass costs, the 12 GB cap, and the tethering ban makes a data eSIM for travel the practical choice.
The 12 GB Fair Use Policy is the factor that most frequently pushes Three customers toward eSIM alternatives. UK travellers are used to generous domestic data allowances, often unlimited. Discovering mid-trip that you're capped at 12 GB is a rude awakening, especially if you've been using Google Maps, uploading to Instagram, and streaming music without restraint.
TurkSIM covers 200+ destinations with prepaid eSIM plans that have no fair use cap. Pick up an eSIM for Europe that covers 36 countries, grab a USA eSIM for a transatlantic trip, or get a Turkey eSIM for that Istanbul adventure. What you buy is what you get, with no hidden roaming ceiling.
The Dual SIM setup works well for Three customers. Keep your Three SIM for UK calls, texts, and WhatsApp verification. Set the TurkSIM eSIM as your data line. Disable data roaming on Three to prevent any roaming charges or fair use deductions. All internet traffic goes through the local eSIM network, with no 12 GB cap and no tethering restrictions.
For Three Pay As You Go customers, a travel eSIM is especially valuable. PAYG roaming rates can reach £6/MB for data in some zones, making even basic browsing prohibitively expensive. A prepaid eSIM with a fixed data allocation removes that risk entirely.
Yes, but only on Value and Complete plans. Value plans include 28 days of free roaming per year, Complete plans include 56 days. Both are subject to a 12 GB monthly data cap. Lite and Advanced plans have no built-in roaming and require purchasing Go Roam passes or Data Passports.
Three caps roaming data at 12 GB per month, regardless of your UK plan's data allowance. If your domestic plan includes unlimited data, you can only use 12 GB of it while abroad. Pay As You Go customers have a 9 GB roaming cap.
Tethering is allowed when roaming in European Go Roam destinations. Outside Europe, tethering is blocked on Go Roam passes. If you need hotspot functionality in non-European destinations, you'll need a Data Passport (£5/day for unlimited data) or a travel eSIM.
Yes, on phones with Dual SIM or eSIM support. Keep Three for calls and texts, use the eSIM for data. Turn off data roaming on your Three line to prevent roaming charges and fair use deductions.
Three restructured its plans into Lite, Advanced, Value, and Complete tiers. Only Value and Complete include built-in roaming. Previously, some plans included roaming by default. Customers who joined before June 22, 2025 may retain their original roaming terms. Check your specific plan in My3.
Without a pass, Lite and Advanced plan customers are auto-charged a daily rate: £2/day in Europe and £5-£7/day in Go Roam Around the World destinations. Pay As You Go rates vary by zone and can be significantly higher, particularly for data.
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