By Three’s Complete SIMs come with inclusive worldwide roaming in 160 destinations. This arguably makes it the best UK SIM card for travelling abroad.
If you’re someone who likes to travel the world, there’s arguably a brand new champion when it comes to the UK’s best SIM card for international roaming.
On Three’s new ‘Complete’ SIM-only deals, you’re now able to use your mobile phone at no extra cost in more than 160 destinations around the world. This means you can stay connected from pretty much anywhere in the world, without the bother or hassle of getting local SIM cards or eSIMs. You’ll also get Paramount+ included at no extra cost, worth £4.99 per month, for the entirety of your plan.
In this article, we’ll review Three’s Complete plans, including the best offers available and what you’ll get included on them. We’ll also take an in-depth look at all of the countries that are included in the offer.
| Prices From: | £15 per month |
|---|---|
| Contract Length: | 12 month or 24 month contract |
| Complete SIM Only Deals: | |
| What’s Included? |
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| Coverage: |
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Contents
Best Complete SIM Card Deals
If you’re looking for one of Three’s new ‘Complete’ plans, they’re currently available from £15 per month in the UK. Although this makes it a little more expensive than the Lite plans (with no roaming included) and the Value plans (with EU roaming included), you do get a lot more included for your money.
In particular, we think the ability to use your mobile phone at no extra cost in over 160 destinations can save you a lot of time and money, compared to getting local SIM cards or eSIMs in each destination when you travel. You also get Paramount+ included at no extra cost, which by itself is worth £4.99 per month.
12 Month Complete Plans
If you’re looking for a Complete SIMO plan on a 12-month contract, the following table shows Three’s best available plans:
| Plan | Data | Monthly Cost | |
|---|---|---|---|
Complete
| 3GB data  
| £15.00 per month 12 month contract Monthly cost rising to £16.00 on 1 Apr 2026 | See deal |
Complete
| 8GB data
| £17.00 per month 12 month contract Monthly cost rising to £18.25 on 1 Apr 2026 | See deal |
Complete
| 25GB data
| £18.00 per month 12 month contract Monthly cost rising to £19.25 on 1 Apr 2026 | See deal |
Complete
| 60GB data
| £20.00 per month 12 month contract Monthly cost rising to £21.25 on 1 Apr 2026 | See deal |
Complete
| 120GB data
| £22.00 per month 12 month contract Monthly cost rising to £23.50 on 1 Apr 2026 | See deal |
Complete
| 250GB data
| £32.00 per month 12 month contract Monthly cost rising to £33.50 on 1 Apr 2026 | See deal |
Complete
| Unlimited data
| £33.00 per month 12 month contract Monthly cost rising to £34.50 on 1 Apr 2026 | See deal |
24 Month Complete Plans
In some cases, it may work out cheaper to sign up for a 24-month ‘Complete SIMO’ plan. That’s particularly the case if you’re able to take advantage of a special introductory offer. You will, however, need to commit on a longer contract to get these deals.
| Plan | Data | Monthly Cost | |
|---|---|---|---|
Complete
| 120GB data
| £13.00 for 12 months, then £26 per month 24 month contract Monthly cost rising to £27.50 on 1 Apr 2026 £29.00 on 1 Apr 2027 | See deal |
Complete
| Unlimited data
| £16.00 for 6 months, then £32 per month 24 month contract Monthly cost rising to £33.50 on 1 Apr 2026 £35.00 on 1 Apr 2027 | See deal |
Complete
| 30GB data
| £18.00 per month 24 month contract Monthly cost rising to £19.25 on 1 Apr 2026 £20.50 on 1 Apr 2027 | See deal |
Complete
| 60GB data
| £20.00 per month 24 month contract Monthly cost rising to £21.25 on 1 Apr 2026 £22.50 on 1 Apr 2027 | See deal |
Complete
| Unlimited data
| £32.00 per month 24 month contract Monthly cost rising to £33.50 on 1 Apr 2026 £35.00 on 1 Apr 2027 | See deal |
Which Countries Are Covered By Roaming?
In our opinion, the biggest stand-out feature of Three’s Complete plans is the fact that you’ll get inclusive roaming in more than 160 worldwide destinations.
It’s a pretty comprehensive offer, that covers all European and North American destinations (with the exception of Monaco), as well as holiday hotspots such as Egypt, Turkey, Thailand, Vietnam, Australia, New Zealand, and the United Arab Emirates (including Dubai and Abu Dhabi). It also covers a good number of destinations across the Caribbean, Latin America, Africa, and Asia.
All of the following destinations are included as part of Three’s worldwide roaming offer on their Complete plans:
- Aland Islands (Finland)
- Albania
- Andorra
- Anguilla
- Antigua and Barbuda
- Argentina
- Armenia
- Aruba (Netherlands Antilles)
- Australia
- Austria
- Azerbaijan
- Azores (Portugal)
- Bahamas
- Bahrain
- Balearic Islands (Spain)
- Bangladesh
- Barbados
- Belgium
- Bermuda
- Bonaire (Netherlands Antilles)
- Bosnia and Herzegovina
- Brazil
- British Virgin Islands
- Brunei
- Bulgaria
- Burkina Faso
- Cambodia
- Cameroon
- Canada
- Canary Islands (Spain)
- Cayman Islands
- Chile
- China
- Colombia
- Costa Rica
- Côte d’Ivoire (Ivory Coast)
- Croatia
- Curacao (Netherlands Antilles)
- Cyprus
- Cyprus, North (Turkey)
- Czech Republic
- Denmark
- Dominica
- Dominican Republic
- Ecuador
- Egypt
- El Salvador
- Estonia
- Faroe Islands
- Finland
- France
- French Guiana
- Gabon
- Georgia
- Germany
- Ghana
- Gibraltar
- Greece
- Greenland
- Grenada
- Guadeloupe
- Guatemala
- Guernsey
- Guinea
- Guyana
- Haiti
- Honduras
- Hong Kong
- Hungary
- Iceland
- India
- Indonesia
- Ireland
- Isle of Man
- Israel
- Italy
- Jamaica
- Japan
- Jersey
- Jordan
- Kazakhstan
- Kenya
- Kosovo
- Kuwait
- Kyrgyzstan
- Latvia
- Liberia
- Liechtenstein
- Lithuania
- Luxembourg
- Macau
- Madagascar
- Madeira (Portugal)
- Malawi
- Malaysia
- Malta
- Martinique
- Mayotte
- Mexico
- Moldova
- Montenegro
- Montserrat
- Morocco
- Myanmar
- Netherlands
- New Zealand
- Nicaragua
- Niger
- Nigeria
- North Macedonia
- Norway
- Oman
- Pakistan
- Panama
- Paraguay
- Peru
- Poland
- Portugal
- Puerto Rico
- Qatar
- Reunion
- Romania
- Rwanda
- Saba (Netherlands Antilles)
- Saint Barthelemy
- Saint Kitts and Nevis
- Saint Lucia
- Saint Martin
- Saint Vincent & Grenadines
- San Marino (Italy)
- Saudi Arabia
- Senegal
- Serbia
- Seychelles
- Singapore
- Sint Eustatius
- Sint Maarten
- Slovakia
- Slovenia
- South Africa
- South Korea
- Spain
- Sri Lanka
- Suriname
- Sweden
- Switzerland
- Taiwan
- Tajikistan
- Thailand
- Trinidad and Tobago
- Tunisia
- Turkey
- Turks and Caicos Islands
- Uganda
- Ukraine
- United Arab Emirates
- United States
- Uruguay
- US Virgin Islands
- Uzbekistan
- Vatican City
- Vietnam
- Zambia
The roaming offer includes usage of your UK minutes and texts (when you’re calling other UK-based numbers), as well as your data (capped at 12GB per month).
In many cases, this makes Three’s Complete SIM Only deal a better and a hassle-free alternative to buying local SIM cards and eSIMs. This is particularly the case as many eSIMs are data-only products, and they often have a fairly high cost per-gigabyte (per-GB) prices.
See the limitations and restrictions of the Go Roam offer.
Which Countries Are Not Included?
Unfortunately, there are some destinations that are excluded from Three’s roaming offer. You won’t be able to use your Complete plan allowances on airline networks, maritime networks, and in the following destinations:
- Afghanistan
- Airlines
- Algeria
- Angola
- Belarus
- Belize
- Bolivia
- Botswana
- Cape Verde
- Congo, Democratic Republic of
- Congo, Republic of
- Cuba
- Equatorial Guinea
- Ethiopia
- Falkland Islands
- Fiji
- French Polynesia
- Gambia
- Guam
- Iraq
- Lebanon
- Libya
- Maldives
- Maritime Networks
- Mauritius
- Monaco
- Mongolia
- Mozambique
- Namibia
- Nepal
- Papua New Guinea
- Philippines
- Russia
- Sierra Leone
- Tanzania
- Togo
- Turkmenistan
- Vanuatu
- Venezuela
- Yemen
In these destinations, you’ll need to pay their standard rates for roaming.
Other Complete Plan Benefits
Paramount+
When you choose a Complete Airtime or Complete SIMO plan, you’ll get Paramount+ included at no extra cost. This will be for the entire length of your plan.
As the inclusive Paramount+ subscription is worth £4.99 per month, we think it’s a pretty decent benefit. You’ll be able to stream a range of shows such as Star Trek, Yellowjackets, Yellowstone, Tulsa King, and 1923. There are also lots of movies available on-demand, including Top Gun: Maverick and Scream.
The inclusive Paramount+ subscription isn’t limited to just your mobile phone: you can also access it from other compatible devices, including your laptop, tablet, or smart TV app.
Handset Warranty & Screen Repair
If you buy a new mobile phone from Three on a ‘Complete Airtime’ plan, you’ll get two additional benefits on your handset:
- Extended warranty (for up to 36 months): As long as you keep the same phone and plan, you can benefit from an extended warranty that covers electrical and mechanical faults on your phone. This doesn’t cover accidental damage.
- Screen repair (once during your contract): If you accidentally damage the screen on your phone, you’ll get a Screen Repair included. This is available once during the minimum term of your contract, and is subject to a £25 excess payment. Given the normal cost of a screen repair is a couple of hundred pounds, this can be a pretty decent benefit.
Three+ Rewards
You’ll also get all of the standard benefits that are available on the rest of Three’s mobile plans, such as Three+ Rewards and access to Three’s fastest available 5G speeds.
With the Three+ rewards app, you’ll get weekly discounts and offers that are exclusive to Three mobile customers. For instance, you can currently get a £1 coffee from Caffè Nero every week, plus discounted cinema tickets and meals outside.
Keeping Your Phone Number
If you’re switching to one of Three’s Complete Pay Monthly plans, it’s a straightforward process keeping your current phone number.
Start by asking your current mobile network to give you a PAC Code. You can get one by texting PAC to 65075, or you can request one through your mobile network’s website or app.
Once you’ve gotten the PAC Code from your old network, you’ll be able to place your order online with Three. You can either give them the PAC Code when you sign up, or you can wait until the SIM card arrives and then fill out this form on their website.
For step-by-step instructions on how to transfer your phone number to Three, please select your current mobile network from the drop-down menu below:
For more information, see our full guide to transferring your phone number between networks.
More Information
For more information about Three’s Pay Monthly plans, see the guide on their website. You can also read our full guide on Three’s SIM-only deals.
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