The international call prefix is ussually represented by a + before the rest of the phone number.
In this section of the website the following countries are listed: Greece, Egypt, Morocco, Algeria, Tunisia, Libya, Gambia, Senegal, Mauritania, Mali, Guinea, Ivory Coast, Burkina Faso, Niger, Togo, Benin, Mauritius, Liberia, Sierra Leone, Ghana, Nigeria, Chad, Central African Republic, Cameroon, Cape Verde, Sao Tomé and Principe, Equatorial Guinea, Gabon, Congo, Angola, Guinea-Bissau, Diego Garcia, Ascension Island, Seychelles, Sudan, Rwanda, Ethiopia, Somalia, Djibouti, Kenya, Tanzania, Uganda, Burundi, Mozambique, Zambia, Madagascar, Mayotte and Réunion, Zimbabwe, Namibia, Malawi, Lesotho, Botswana, Swaziland, Comoros, South Africa, Saint Helena, Eritrea, Aruba, Faroe Islands, Greenland.