Looking for a powerful, data-packed SIM only plan with UK-wide 5G coverage?
Three SIM only deals are among the most popular and best-rated in the UK, offering unlimited data, affordable 1-month and 12-month options, and extensive roaming benefits.
Why Choose Three?
- Massive 5G Network – one of the UK’s fastest and most reliable.
- Flexible Contracts – choose from 1-month rolling or 12/24-month plans.
- Unlimited Data Options – ideal for streaming, gaming, and sharing.
- Go Roam – use your plan in 71 destinations worldwide.
- Award-Winning Coverage – great performance across most UK cities.
Top Three SIM Only Plans This Month
49 Roaming Destinations
12GB
Åland Islands (Finland)
Austria
Azores (Portugal)
Balearic Islands (Spain)
Belgium
Bulgaria
Canary Islands (Spain)
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Finland
France
French Guiana
Germany
Gibraltar
Greece
Guadeloupe
Guernsey
Hungary
Iceland
Ireland
Isle of Man
Italy
Jersey
Latvia
Liechtenstein
Lithuania
Luxembourg
Madeira (Portugal)
Malta
Martinique
Mayotte
Netherlands
Norway
Poland
Portugal
Réunion
Romania
Saint Barthelemy
Saint Martin
San Marino (Italy)
Slovakia
Slovenia
Spain
Sweden
Switzerland
Vatican City
163 Roaming Destinations
12GB
Åland Islands (Finland)
Austria
Azores (Portugal)
Balearic Islands (Spain)
Belgium
Bulgaria
Canary Islands (Spain)
Croatia
Cyprus
Czech Republic
Denmark
Estonia
Finland
France
French Guiana
Germany
Gibraltar
Greece
Guadeloupe
Guernsey
Hungary
Iceland
Ireland
Isle of Man
Italy
Jersey
Latvia
Liechtenstein
Lithuania
Luxembourg
Madeira (Portugal)
Malta
Martinique
Mayotte
Netherlands
Norway
Poland
Portugal
Réunion
Romania
Saint Barthelemy
Saint Martin
San Marino (Italy)
Slovakia
Slovenia
Spain
Sweden
Switzerland
Vatican City
Australia
Brazil
Chile
Colombia
Costa Rica
El Salvador
Guatemala
Hong Kong (China)
Indonesia
Macao (China)
New Zealand
Nicaragua
Panama
Peru
Puerto Rico
Singapore
Sri Lanka
United States of America (USA)
Uruguay
U.S. Virgin Islands
Vietnam
Albania
Andorra
Anguilla
Antigua and Barbuda
Argentina
Armenia
Aruba (Netherlands Antilles)
Azerbaijan
Bahamas
Bahrain
Bangladesh
Barbados
Bermuda
Bonaire (Netherlands Antilles)
Bosnia and Herzegovina
British Virgin Islands
Brunei
Burkina Faso
Cambodia
Cameroon
Canada
Cayman Islands
China
Curaçao (Netherlands Antilles)
Cyprus, North (Turkey)
Côte d’Ivoire (Ivory Coast)
Dominica
Dominican Republic
Ecuador
Egypt
Faroe Islands
Gabon
Georgia
Ghana
Greenland
Grenada
Guinea
Guyana
Haiti
Honduras
India
Jamaica
Japan
Jordan
Kazakhstan
Kenya
Kosovo
Kuwait
Kyrgyzstan
Liberia
Madagascar
Malawi
Malaysia
Mexico
Moldova
Montenegro
Montserrat
Morocco
Myanmar
Niger
Nigeria
North Macedonia
Oman
Pakistan
Paraguay
Qatar
Rwanda
Saba (Netherlands Antilles)
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
Saudi Arabia
Senegal
Serbia
Seychelles
Sint Eustatius (Netherlands Antilles)
Sint Maarten (Netherlands Antilles)
South Africa
South Korea
Suriname
Taiwan
Tajikistan
Thailand
Trinidad and Tobago
Tunisia
Turkey
Turks and Caicos Islands
Uganda
Ukraine
United Arab Emirates (UAE)
Uzbekistan
Zambia
163 Roaming Destinations
12GB
🇦🇽 Åland Islands (Finland)
🇦🇹 Austria
🇵🇹 Azores (Portugal)
🇪🇸 Balearic Islands (Spain)
🇧🇪 Belgium
🇧🇬 Bulgaria
🇪🇸 Canary Islands (Spain)
🇭🇷 Croatia
🇨🇾 Cyprus
🇨🇿 Czech Republic
🇩🇰 Denmark
🇪🇪 Estonia
🇫🇮 Finland
🇫🇷 France
🇬🇫 French Guiana
🇩🇪 Germany
🇬🇮 Gibraltar
🇬🇷 Greece
🇬🇵 Guadeloupe
🇬🇬 Guernsey
🇭🇺 Hungary
🇮🇸 Iceland
🇮🇪 Ireland
🇮🇲 Isle of Man
🇮🇹 Italy
🇯🇪 Jersey
🇱🇻 Latvia
🇱🇮 Liechtenstein
🇱🇹 Lithuania
🇱🇺 Luxembourg
🇵🇹 Madeira (Portugal)
🇲🇹 Malta
🇲🇶 Martinique
🇾🇹 Mayotte
🇳🇱 Netherlands
🇳🇴 Norway
🇵🇱 Poland
🇵🇹 Portugal
🇷🇪 Réunion
🇷🇴 Romania
🇧🇱 Saint Barthelemy
🇫🇷 Saint Martin
🇸🇲 San Marino (Italy)
🇸🇰 Slovakia
🇸🇮 Slovenia
🇪🇸 Spain
🇸🇪 Sweden
🇨🇭 Switzerland
🇻🇦 Vatican City
🇦🇺 Australia
🇧🇷 Brazil
🇨🇱 Chile
🇨🇴 Colombia
🇨🇷 Costa Rica
🇸🇻 El Salvador
🇬🇹 Guatemala
🇭🇰 Hong Kong (China)
🇮🇩 Indonesia
🇲🇴 Macao (China)
🇳🇿 New Zealand
🇳🇮 Nicaragua
🇵🇦 Panama
🇵🇪 Peru
🇵🇷 Puerto Rico
🇸🇬 Singapore
🇱🇰 Sri Lanka
🇺🇸 United States of America (USA)
🇺🇾 Uruguay
🇻🇮 U.S. Virgin Islands
🇻🇳 Vietnam
🇦🇱 Albania
🇦🇩 Andorra
🇦🇬 Anguilla
🇦🇬 Antigua and Barbuda
🇦🇷 Argentina
🇦🇲 Armenia
🇦🇼 Aruba (Netherlands Antilles)
🇦🇿 Azerbaijan
🇧🇸 Bahamas
🇧🇭 Bahrain
🇧🇩 Bangladesh
🇧🇧 Barbados
🇧🇲 Bermuda
🇧🇴 Bonaire (Netherlands Antilles)
🇧🇦 Bosnia and Herzegovina
🇻🇬 British Virgin Islands
🇧🇳 Brunei
🇧🇫 Burkina Faso
🇰🇭 Cambodia
🇨🇲 Cameroon
🇨🇦 Canada
🇰🇾 Cayman Islands
🇨🇳 China
🇨🇼 Curaçao (Netherlands Antilles)
🇹🇷 Cyprus, North (Turkey)
🇨🇮 Côte d’Ivoire (Ivory Coast)
🇩🇲 Dominica
🇩🇴 Dominican Republic
🇪🇨 Ecuador
🇪🇬 Egypt
🇫🇴 Faroe Islands
🇬🇦 Gabon
🇬🇪 Georgia
🇬🇭 Ghana
🇬🇱 Greenland
🇬🇩 Grenada
🇬🇳 Guinea
🇬🇾 Guyana
🇭🇹 Haiti
🇭🇳 Honduras
🇮🇳 India
🇯🇲 Jamaica
🇯🇵 Japan
🇯🇴 Jordan
🇰🇿 Kazakhstan
🇰🇪 Kenya
🇽🇰 Kosovo
🇰🇼 Kuwait
🇰🇬 Kyrgyzstan
🇱🇷 Liberia
🇲🇬 Madagascar
🇲🇼 Malawi
🇲🇾 Malaysia
🇲🇽 Mexico
🇲🇩 Moldova
🇲🇪 Montenegro
🇲🇸 Montserrat
🇲🇦 Morocco
🇲🇲 Myanmar
🇳🇪 Niger
🇳🇬 Nigeria
🇲🇰 North Macedonia
🇴🇲 Oman
🇵🇰 Pakistan
🇵🇾 Paraguay
🇶🇦 Qatar
🇷🇼 Rwanda
🇧🇶 Saba (Netherlands Antilles)
🇰🇳 Saint Kitts and Nevis
🇱🇨 Saint Lucia
🇻🇨 Saint Vincent and the Grenadines
🇸🇦 Saudi Arabia
🇸🇳 Senegal
🇷🇸 Serbia
🇸🇨 Seychelles
🇧🇶 Sint Eustatius (Netherlands Antilles)
🇧🇶 Sint Maarten (Netherlands Antilles)
🇿🇦 South Africa
🇰🇷 South Korea
🇸🇷 Suriname
🇹🇼 Taiwan
🇹🇯 Tajikistan
🇹🇭 Thailand
🇹🇹 Trinidad and Tobago
🇹🇳 Tunisia
🇹🇷 Turkey
🇹🇨 Turks and Caicos Islands
🇺🇬 Uganda
🇺🇦 Ukraine
🇦🇪 United Arab Emirates (UAE)
🇺🇿 Uzbekistan
🇿🇲 Zambia
49 Roaming Destinations
12GB
🇦🇽 Åland Islands (Finland)
🇦🇹 Austria
🇵🇹 Azores (Portugal)
🇪🇸 Balearic Islands (Spain)
🇧🇪 Belgium
🇧🇬 Bulgaria
🇪🇸 Canary Islands (Spain)
🇭🇷 Croatia
🇨🇾 Cyprus
🇨🇿 Czech Republic
🇩🇰 Denmark
🇪🇪 Estonia
🇫🇮 Finland
🇫🇷 France
🇬🇫 French Guiana
🇩🇪 Germany
🇬🇮 Gibraltar
🇬🇷 Greece
🇬🇵 Guadeloupe
🇬🇬 Guernsey
🇭🇺 Hungary
🇮🇸 Iceland
🇮🇪 Ireland
🇮🇲 Isle of Man
🇮🇹 Italy
🇯🇪 Jersey
🇱🇻 Latvia
🇱🇮 Liechtenstein
🇱🇹 Lithuania
🇱🇺 Luxembourg
🇵🇹 Madeira (Portugal)
🇲🇹 Malta
🇲🇶 Martinique
🇾🇹 Mayotte
🇳🇱 Netherlands
🇳🇴 Norway
🇵🇱 Poland
🇵🇹 Portugal
🇷🇪 Réunion
🇷🇴 Romania
🇧🇱 Saint Barthelemy
🇫🇷 Saint Martin
🇸🇲 San Marino (Italy)
🇸🇰 Slovakia
🇸🇮 Slovenia
🇪🇸 Spain
🇸🇪 Sweden
🇨🇭 Switzerland
🇻🇦 Vatican City
163 Roaming Destinations
12GB
🇦🇽 Åland Islands (Finland)
🇦🇹 Austria
🇵🇹 Azores (Portugal)
🇪🇸 Balearic Islands (Spain)
🇧🇪 Belgium
🇧🇬 Bulgaria
🇪🇸 Canary Islands (Spain)
🇭🇷 Croatia
🇨🇾 Cyprus
🇨🇿 Czech Republic
🇩🇰 Denmark
🇪🇪 Estonia
🇫🇮 Finland
🇫🇷 France
🇬🇫 French Guiana
🇩🇪 Germany
🇬🇮 Gibraltar
🇬🇷 Greece
🇬🇵 Guadeloupe
🇬🇬 Guernsey
🇭🇺 Hungary
🇮🇸 Iceland
🇮🇪 Ireland
🇮🇲 Isle of Man
🇮🇹 Italy
🇯🇪 Jersey
🇱🇻 Latvia
🇱🇮 Liechtenstein
🇱🇹 Lithuania
🇱🇺 Luxembourg
🇵🇹 Madeira (Portugal)
🇲🇹 Malta
🇲🇶 Martinique
🇾🇹 Mayotte
🇳🇱 Netherlands
🇳🇴 Norway
🇵🇱 Poland
🇵🇹 Portugal
🇷🇪 Réunion
🇷🇴 Romania
🇧🇱 Saint Barthelemy
🇫🇷 Saint Martin
🇸🇲 San Marino (Italy)
🇸🇰 Slovakia
🇸🇮 Slovenia
🇪🇸 Spain
🇸🇪 Sweden
🇨🇭 Switzerland
🇻🇦 Vatican City
🇦🇺 Australia
🇧🇷 Brazil
🇨🇱 Chile
🇨🇴 Colombia
🇨🇷 Costa Rica
🇸🇻 El Salvador
🇬🇹 Guatemala
🇭🇰 Hong Kong (China)
🇮🇩 Indonesia
🇲🇴 Macao (China)
🇳🇿 New Zealand
🇳🇮 Nicaragua
🇵🇦 Panama
🇵🇪 Peru
🇵🇷 Puerto Rico
🇸🇬 Singapore
🇱🇰 Sri Lanka
🇺🇸 United States of America (USA)
🇺🇾 Uruguay
🇻🇮 U.S. Virgin Islands
🇻🇳 Vietnam
🇦🇱 Albania
🇦🇩 Andorra
🇦🇬 Anguilla
🇦🇬 Antigua and Barbuda
🇦🇷 Argentina
🇦🇲 Armenia
🇦🇼 Aruba (Netherlands Antilles)
🇦🇿 Azerbaijan
🇧🇸 Bahamas
🇧🇭 Bahrain
🇧🇩 Bangladesh
🇧🇧 Barbados
🇧🇲 Bermuda
🇧🇴 Bonaire (Netherlands Antilles)
🇧🇦 Bosnia and Herzegovina
🇻🇬 British Virgin Islands
🇧🇳 Brunei
🇧🇫 Burkina Faso
🇰🇭 Cambodia
🇨🇲 Cameroon
🇨🇦 Canada
🇰🇾 Cayman Islands
🇨🇳 China
🇨🇼 Curaçao (Netherlands Antilles)
🇹🇷 Cyprus, North (Turkey)
🇨🇮 Côte d’Ivoire (Ivory Coast)
🇩🇲 Dominica
🇩🇴 Dominican Republic
🇪🇨 Ecuador
🇪🇬 Egypt
🇫🇴 Faroe Islands
🇬🇦 Gabon
🇬🇪 Georgia
🇬🇭 Ghana
🇬🇱 Greenland
🇬🇩 Grenada
🇬🇳 Guinea
🇬🇾 Guyana
🇭🇹 Haiti
🇭🇳 Honduras
🇮🇳 India
🇯🇲 Jamaica
🇯🇵 Japan
🇯🇴 Jordan
🇰🇿 Kazakhstan
🇰🇪 Kenya
🇽🇰 Kosovo
🇰🇼 Kuwait
🇰🇬 Kyrgyzstan
🇱🇷 Liberia
🇲🇬 Madagascar
🇲🇼 Malawi
🇲🇾 Malaysia
🇲🇽 Mexico
🇲🇩 Moldova
🇲🇪 Montenegro
🇲🇸 Montserrat
🇲🇦 Morocco
🇲🇲 Myanmar
🇳🇪 Niger
🇳🇬 Nigeria
🇲🇰 North Macedonia
🇴🇲 Oman
🇵🇰 Pakistan
🇵🇾 Paraguay
🇶🇦 Qatar
🇷🇼 Rwanda
🇧🇶 Saba (Netherlands Antilles)
🇰🇳 Saint Kitts and Nevis
🇱🇨 Saint Lucia
🇻🇨 Saint Vincent and the Grenadines
🇸🇦 Saudi Arabia
🇸🇳 Senegal
🇷🇸 Serbia
🇸🇨 Seychelles
🇧🇶 Sint Eustatius (Netherlands Antilles)
🇧🇶 Sint Maarten (Netherlands Antilles)
🇿🇦 South Africa
🇰🇷 South Korea
🇸🇷 Suriname
🇹🇼 Taiwan
🇹🇯 Tajikistan
🇹🇭 Thailand
🇹🇹 Trinidad and Tobago
🇹🇳 Tunisia
🇹🇷 Turkey
🇹🇨 Turks and Caicos Islands
🇺🇬 Uganda
🇺🇦 Ukraine
🇦🇪 United Arab Emirates (UAE)
🇺🇿 Uzbekistan
🇿🇲 Zambia
163 Roaming Destinations
12GB
🇦🇽 Åland Islands (Finland)
🇦🇹 Austria
🇵🇹 Azores (Portugal)
🇪🇸 Balearic Islands (Spain)
🇧🇪 Belgium
🇧🇬 Bulgaria
🇪🇸 Canary Islands (Spain)
🇭🇷 Croatia
🇨🇾 Cyprus
🇨🇿 Czech Republic
🇩🇰 Denmark
🇪🇪 Estonia
🇫🇮 Finland
🇫🇷 France
🇬🇫 French Guiana
🇩🇪 Germany
🇬🇮 Gibraltar
🇬🇷 Greece
🇬🇵 Guadeloupe
🇬🇬 Guernsey
🇭🇺 Hungary
🇮🇸 Iceland
🇮🇪 Ireland
🇮🇲 Isle of Man
🇮🇹 Italy
🇯🇪 Jersey
🇱🇻 Latvia
🇱🇮 Liechtenstein
🇱🇹 Lithuania
🇱🇺 Luxembourg
🇵🇹 Madeira (Portugal)
🇲🇹 Malta
🇲🇶 Martinique
🇾🇹 Mayotte
🇳🇱 Netherlands
🇳🇴 Norway
🇵🇱 Poland
🇵🇹 Portugal
🇷🇪 Réunion
🇷🇴 Romania
🇧🇱 Saint Barthelemy
🇫🇷 Saint Martin
🇸🇲 San Marino (Italy)
🇸🇰 Slovakia
🇸🇮 Slovenia
🇪🇸 Spain
🇸🇪 Sweden
🇨🇭 Switzerland
🇻🇦 Vatican City
🇦🇺 Australia
🇧🇷 Brazil
🇨🇱 Chile
🇨🇴 Colombia
🇨🇷 Costa Rica
🇸🇻 El Salvador
🇬🇹 Guatemala
🇭🇰 Hong Kong (China)
🇮🇩 Indonesia
🇲🇴 Macao (China)
🇳🇿 New Zealand
🇳🇮 Nicaragua
🇵🇦 Panama
🇵🇪 Peru
🇵🇷 Puerto Rico
🇸🇬 Singapore
🇱🇰 Sri Lanka
🇺🇸 United States of America (USA)
🇺🇾 Uruguay
🇻🇮 U.S. Virgin Islands
🇻🇳 Vietnam
🇦🇱 Albania
🇦🇩 Andorra
🇦🇬 Anguilla
🇦🇬 Antigua and Barbuda
🇦🇷 Argentina
🇦🇲 Armenia
🇦🇼 Aruba (Netherlands Antilles)
🇦🇿 Azerbaijan
🇧🇸 Bahamas
🇧🇭 Bahrain
🇧🇩 Bangladesh
🇧🇧 Barbados
🇧🇲 Bermuda
🇧🇴 Bonaire (Netherlands Antilles)
🇧🇦 Bosnia and Herzegovina
🇻🇬 British Virgin Islands
🇧🇳 Brunei
🇧🇫 Burkina Faso
🇰🇭 Cambodia
🇨🇲 Cameroon
🇨🇦 Canada
🇰🇾 Cayman Islands
🇨🇳 China
🇨🇼 Curaçao (Netherlands Antilles)
🇹🇷 Cyprus, North (Turkey)
🇨🇮 Côte d’Ivoire (Ivory Coast)
🇩🇲 Dominica
🇩🇴 Dominican Republic
🇪🇨 Ecuador
🇪🇬 Egypt
🇫🇴 Faroe Islands
🇬🇦 Gabon
🇬🇪 Georgia
🇬🇭 Ghana
🇬🇱 Greenland
🇬🇩 Grenada
🇬🇳 Guinea
🇬🇾 Guyana
🇭🇹 Haiti
🇭🇳 Honduras
🇮🇳 India
🇯🇲 Jamaica
🇯🇵 Japan
🇯🇴 Jordan
🇰🇿 Kazakhstan
🇰🇪 Kenya
🇽🇰 Kosovo
🇰🇼 Kuwait
🇰🇬 Kyrgyzstan
🇱🇷 Liberia
🇲🇬 Madagascar
🇲🇼 Malawi
🇲🇾 Malaysia
🇲🇽 Mexico
🇲🇩 Moldova
🇲🇪 Montenegro
🇲🇸 Montserrat
🇲🇦 Morocco
🇲🇲 Myanmar
🇳🇪 Niger
🇳🇬 Nigeria
🇲🇰 North Macedonia
🇴🇲 Oman
🇵🇰 Pakistan
🇵🇾 Paraguay
🇶🇦 Qatar
🇷🇼 Rwanda
🇧🇶 Saba (Netherlands Antilles)
🇰🇳 Saint Kitts and Nevis
🇱🇨 Saint Lucia
🇻🇨 Saint Vincent and the Grenadines
🇸🇦 Saudi Arabia
🇸🇳 Senegal
🇷🇸 Serbia
🇸🇨 Seychelles
🇧🇶 Sint Eustatius (Netherlands Antilles)
🇧🇶 Sint Maarten (Netherlands Antilles)
🇿🇦 South Africa
🇰🇷 South Korea
🇸🇷 Suriname
🇹🇼 Taiwan
🇹🇯 Tajikistan
🇹🇭 Thailand
🇹🇹 Trinidad and Tobago
🇹🇳 Tunisia
🇹🇷 Turkey
🇹🇨 Turks and Caicos Islands
🇺🇬 Uganda
🇺🇦 Ukraine
🇦🇪 United Arab Emirates (UAE)
🇺🇿 Uzbekistan
🇿🇲 Zambia
73 Roaming Destinations
12GB
🇦🇽 Åland
🇦🇺 Australia
🇦🇹 Austria
🇵🇹 Azores
🇪🇸 Balearic Islands
🇧🇪 Belgium
🇧🇷 Brazil
🇧🇬 Bulgaria
🇪🇸 Canary Islands
🇨🇱 Chile
🇨🇴 Colombia
🇨🇷 Costa Rica
🇭🇷 Croatia
🇨🇾 Cyprus
🇨🇿 Czech Republic
🇩🇰 Denmark
🇸🇻 El Salvador
🇪🇪 Estonia
🇫🇰 Falkland Islands
🇫🇮 Finland
🇫🇷 France
🇩🇪 Germany
🇬🇮 Gibraltar
🇬🇷 Greece
🇬🇱 Greenland
🇬🇵 Guadeloupe
🇬🇹 Guatemala
🇬🇬 Guernsey
🇬🇫 Guyane (French Guiana)
🇭🇰 Hong Kong
🇭🇺 Hungary
🇮🇸 Iceland
🇮🇩 Indonesia
🇮🇪 Ireland
🇮🇲 Isle of Man
🇮🇹 Italy
🇯🇪 Jersey
🇱🇻 Latvia
🇱🇮 Liechtenstein
🇱🇹 Lithuania
🇱🇺 Luxembourg
🇲🇴 Macao
🇵🇹 Madeira
🇲🇹 Malta
🇲🇶 Martinique
🇾🇹 Mayotte
🇳🇱 Netherlands
🇳🇿 New Zealand
🇳🇮 Nicaragua
🇳🇴 Norway
🇵🇦 Panama
🇵🇪 Peru
🇵🇱 Poland
🇵🇹 Portugal
🇵🇷 Puerto Rico
🇷🇪 Réunion
🇷🇴 Romania
🇧🇱 Saint-Barthélemy
🇫🇷 Saint-Martin (FR)
🇸🇲 San Marino
🇸🇬 Singapore
🇸🇰 Slovakia
🇸🇮 Slovenia
🇪🇸 Spain
🇱🇰 Sri Lanka
🇸🇪 Sweden
🇨🇭 Switzerland
🇻🇮 U.S. Virgin Islands
🇺🇾 Uruguay
🇺🇸 USA
🇻🇦 Vatican City
🇻🇳 Vietnam
Three vs Other Networks
Compared to O2, EE, and Vodafone, Three consistently leads on value for money — offering unlimited data from under £20, free roaming in 70+ countries, and broad 5G coverage included in every plan. Three remains one of the most competitive SIM only providers in the UK.
Who Is Three Best For?
Perfect for heavy data users, travelers, and families who want reliable, high-speed 5G and global roaming.
If you’re constantly streaming, gaming, or tethering, Three’s unlimited plans are built for you.
How to Switch to Three
- Visit Three.co.uk to order your SIM.
- Request your PAC code from your old provider.
- Activate your new SIM — keep your number and start using Three’s network instantly.
See our detailed guide on How To Switch Sim Providers
Final Verdict
Active and valid Three SIM only deals offer unbeatable data value, fast 5G, and generous roaming.
Whether you want a 1-month flexible plan or an unlimited powerhouse, Three continues to be one of the best SIM only choices in the UK.
