| Country | Zone | Country | Zone | Country | Zone |
|---|---|---|---|---|---|
| Afghanistan | 4 | Germany | 1b | Peru | 4 |
| Algeria | 1b | Gibraltar | 1b | Philippines | 3 |
| American Samoa | 3 | Greece | 1b | Poland | 1b |
| Andorra | 3 | Grenada | 2 | Portugal | 1b |
| Anguilla | 2 | Guyana | 3 | Puerto Rico | 4 |
| Antigua & Barbuda | 4 | Haiti | 3 | Qatar | 3 |
| Argentina | 3 | Hong Kong | 2 | Romania | 1b |
| Armemia | 1b | Hungary | 1b | Russia | 3 |
| Aruba | 2 | Iceland | 4 | Saudi Arabia | 1b |
| Australia | 1b | India | 5 | Serbia | 2 |
| Austria | 1b | Indonesia | 3 | Seychelles | 2 |
| Azerbaijan | 1b | Iraq | 3 | Sierra Leone | 3 |
| Bahamas | 4 | Ireland | 1b | Singapore | 1b |
| Bahrain | 1b | Israel | 1b | Slovakia | 1b |
| Barbados | 2 | Italy | 1a | Slovenia | 1b |
| Belgium | 1b | Jamaica | 2 | South Africa | 1b |
| Bermuda | 5 | Japan | 1b | Spain | 1a |
| Bosnia Herzegovina | 1b | Kazakhstan | 4 | Sri Lanka | 3 |
| Brazil | 1b | Kenya | 1b | St Kitts & Nevis | 3 |
| British Virgin Islands | 1b | Kuwait | 3 | St Lucia | 2 |
| Bulgaria | 2 | Latvia | 1b | St Vincent & The Grenadines | 2 |
| Canada | 4 | Lebanon | 2 | Sweden | 1b |
| Cayman Islands | 2 | Liechtenstein | 2 | Switzerland | 1b |
| Chile | 2 | Lithuania | 1b | Taiwan | 2 |
| China | 3 | Luxembourg | 1b | Tajikstan | 1b |
| Colombia | 5 | Macau | 3 | Tanzania | 1b |
| Croatia | 1b | Malaysia | 3 | Thailand | 3 |
| Cruise Ships (Select Ships Only) | 4 | Malta | 2 | Trinidad & Tobago | 3 |
| Cuba | 5 | Mauritius | 3 | Tunisia | 2 |
| Cyprus (South) | 1b | Mexico | 4 | Turkey | 1b |
| Czech Republic | 1b | Montenegro | 2 | Turks & Caicos | 3 |
| Denmark | 1b | Montserrat | 1b | Ukraine | 3 |
| Dominica | 2 | Morocco | 2 | United Arab Emirates | 1b |
| Dominican Republic | 4 | Mozambique | 2 | United Kingdom | 1a |
| Egypt | 1b | Namibia | 3 | United States | 4 |
| El Salvador | 1b | Netherlands | 1b | Uruguay | 3 |
| Estonia | 1b | Netherlands Antilles | 2 | Us Virgin Islands | 4 |
| Faeroe Island | 3 | New Zealand | 2 | Uzbekistan | 1b |
| Finland | 1b | Nigeria | 1b | Zambia (*) | 1b |
| France | 1a | Norway | 1b | ||
| Gambia | 2 | Pakistan | 3 | ||
| Georgia | 1b | Panama | 5 |
* Service in this country is currently being tested. The service is operational, but outages due to technical implementation are likely. If reliability of service is required, then we recommend purchasing a local SIM card for this country.