Pourquoi diable ?
Lorsque vous effectuez un appel international, vous devez indiquer à la compagnie de téléphone que le numéro composé n’est pas local. Vous composez donc un préfixe, puis l’indicatif du pays, et enfin le numéro de téléphone. Jusque-là, rien de spécial. Mais, malgré la norme internationale établie par l’UIT, qui recommande d’utiliser 00 comme préfixe international, certains pays utilisent encore d’autres codes tels que 011 (États-Unis et filiales) ou des codes plus exotiques comme 000, 001, 0011, 119, 810 etc… C’est un grand bordel et une situation désolante.
La solution au problème
Mais il y a une ruse : la norme GSM (tous les appels téléphoniques mobiles) permet d’utiliser le signe + (signe plus) comme préfixe international universel. Et comme la plupart des appels téléphoniques sont bien sûr numériques par nature, la plupart des opérateurs téléphoniques permettent maintenant d’utiliser le préfixe « + » même en utilisant un téléphone « ligne fixe », et même pour les appels locaux.
C’est donc une évidence : vous devez sauvegarder une fois pour toutes vos numéros de téléphone dans votre carnet d’adresses / gestionnaire de contacts en utilisant la convention + : préfixez tous les numéros de téléphone avec l’indicatif du pays + et supprimez le préfixe local (généralement 0).
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Indicatifs téléphoniques internationaux des pays – la liste
| Afghanistan | +93 | 
| Åland | +358 18 | 
| Albania | +355 | 
| Algeria | +213 | 
| American Samoa | +1 684 | 
| Andorra | +376 | 
| Angola | +244 | 
| Anguilla | +1 264 | 
| Antigua and Barbuda | +1 268 | 
| Argentina | +54 | 
| Armenia | +374 | 
| Aruba | +297 | 
| Ascension | +247 | 
| Australia | +61 | 
| Australian Antarctic Territory | +672 1 | 
| Australian External Territories | +672 | 
| Austria | +43 | 
| Azerbaijan | +994 | 
| Bahamas | +1 242 | 
| Bahrain | +973 | 
| Bangladesh | +880 | 
| Barbados | +1 246 | 
| Barbuda | +1 268 | 
| Belarus | +375 | 
| Belgium | +32 | 
| Belize | +501 | 
| Benin | +229 | 
| Bermuda | +1 441 | 
| Bhutan | +975 | 
| Bolivia | +591 | 
| Bonaire | +599 7 | 
| Bosnia and Herzegovina | +387 | 
| Botswana | +267 | 
| Brazil | +55 | 
| British Indian Ocean Territory | +246 | 
| British Virgin Islands | +1 284 | 
| Brunei Darussalam | +673 | 
| Bulgaria | +359 | 
| Burkina Faso | +226 | 
| Burundi | +257 | 
| Cape Verde | +238 | 
| Cambodia | +855 | 
| Cameroon | +237 | 
| Canada | +1 | 
| Caribbean Netherlands +599 3, +599 4, | +599 7 | 
| Cayman Islands | +1 345 | 
| Central African Republic | +236 | 
| Chad | +235 | 
| Chatham Island, New Zealand | +64 | 
| Chile | +56 | 
| China | +86 | 
| Christmas Island | +61 89164 | 
| Cocos (Keeling) Islands | +61 89162 | 
| Colombia | +57 | 
| Comoros | +269 | 
| Congo | +242 | 
| Congo, Democratic Republic of the | +243 | 
| Cook Islands | +682 | 
| Costa Rica | +506 | 
| Ivory Coast (Côte d’Ivoire) | +225 | 
| Croatia | +385 | 
| Cuba | +53 | 
| Curaçao | +599 9 | 
| Cyprus | +357 | 
| Czech Republic | +420 | 
| Denmark | +45 | 
| Diego Garcia | +246 | 
| Djibouti | +253 | 
| Dominica | +1 767 | 
| Dominican Republic +1 809, +1 829, | +1 849 | 
| Easter Island | +56 | 
| Ecuador | +593 | 
| Egypt | +20 | 
| El Salvador | +503 | 
| Ellipso (Mobile Satellite service) +881 2, | +881 3 | 
| EMSAT (Mobile Satellite service) | +882 13 | 
| Equatorial Guinea | +240 | 
| Eritrea | +291 | 
| Estonia | +372 | 
| Eswatini | +268 | 
| Ethiopia | +251 | 
| Falkland Islands | +500 | 
| Faroe Islands | +298 | 
| Fiji | +679 | 
| Finland | +358 | 
| France | +33 | 
| French Antilles | +596 | 
| French Guiana | +594 | 
| French Polynesia | +689 | 
| Gabon | +241 | 
| Gambia | +220 | 
| Georgia | +995 | 
| Germany | +49 | 
| Ghana | +233 | 
| Gibraltar | +350 | 
| Global Mobile Satellite System (GMSS) | +881 | 
| Globalstar (Mobile Satellite Service) +881 8, | +881 9 | 
| Greece | +30 | 
| Greenland | +299 | 
| Grenada | +1 473 | 
| Guadeloupe | +590 | 
| Guam | +1 671 | 
| Guatemala | +502 | 
| Guernsey +44 1481, +44 7781, | +44 7839, +44 7911 | 
| Guinea | +224 | 
| Guinea-Bissau | +245 | 
| Guyana | +592 | 
| Haiti | +509 | 
| Honduras | +504 | 
| Hong Kong | +852 | 
| Hungary | +36 | 
| Iceland | +354 | 
| ICO Global (Mobile Satellite Service) +881 0, | +881 1 | 
| India | +91 | 
| Indonesia | +62 | 
| Inmarsat SNAC | +870 | 
| International Freephone Service (UIFN) | +800 | 
| International Networks +882, | +883 | 
| International Premium Rate Service | +979 | 
| International Shared Cost Service (ISCS) | +808 | 
| Iran | +98 | 
| Iraq | +964 | 
| Ireland | +353 | 
| Iridium (Mobile Satellite service) +881 6, | +881 7 | 
| Isle of Man +44 1624, +44 7524, | +44 7624, +44 7924 | 
| Israel | +972 | 
| Italy | +39 | 
| Jamaica +1 658, | +1 876 | 
| Jan Mayen | +47 79 | 
| Japan | +81 | 
| Jersey | +44 1534 | 
| Jordan | +962 | 
| Kazakhstan +7 6, | +7 7[notes 1] | 
| Kenya | +254 | 
| Kiribati | +686 | 
| Korea, North | +850 | 
| Korea, South | +82 | 
| Kosovo | +383 | 
| Kuwait | +965 | 
| Kyrgyzstan | +996 | 
| Laos | +856 | 
| Latvia | +371 | 
| Lebanon | +961 | 
| Lesotho | +266 | 
| Liberia | +231 | 
| Libya | +218 | 
| Liechtenstein | +423 | 
| Lithuania | +370 | 
| Luxembourg | +352 | 
| Macau | +853 | 
| Madagascar | +261 | 
| Malawi | +265 | 
| Malaysia | +60 | 
| Maldives | +960 | 
| Mali | +223 | 
| Malta | +356 | 
| Marshall Islands | +692 | 
| Martinique | +596 | 
| Mauritania | +222 | 
| Mauritius | +230 | 
| Mayotte +262 269, | +262 639 | 
| Mexico | +52 | 
| Micronesia, Federated States of | +691 | 
| Midway Island, USA | +1 808 | 
| Moldova | +373 | 
| Monaco | +377 | 
| Mongolia | +976 | 
| Montenegro | +382 | 
| Montserrat | +1 664 | 
| Morocco | +212 | 
| Mozambique | +258 | 
| Myanmar | +95 | 
| Artsakh +374 47, | +374 97 | 
| Namibia | +264 | 
| Nauru | +674 | 
| Nepal | +977 | 
| Netherlands | +31 | 
| Nevis | +1 869 | 
| New Caledonia | +687 | 
| New Zealand | +64 | 
| Nicaragua | +505 | 
| Niger | +227 | 
| Nigeria | +234 | 
| Niue | +683 | 
| Norfolk Island | +672 3 | 
| North Macedonia | +389 | 
| Northern Cyprus | +90 392 | 
| Northern Ireland | +44 28 | 
| Northern Mariana Islands | +1 670 | 
| Norway | +47 | 
| Oman | +968 | 
| Pakistan | +92 | 
| Palau | +680 | 
| Palestine, State of | +970 | 
| Panama | +507 | 
| Papua New Guinea | +675 | 
| Paraguay | +595 | 
| Peru | +51 | 
| Philippines | +63 | 
| Pitcairn Islands | +64 | 
| Poland | +48 | 
| Portugal | +351 | 
| Puerto Rico +1 787, | +1 939 | 
| Qatar | +974 | 
| Réunion | +262 | 
| Romania | +40 | 
| Russia | +7[notes 1] | 
| Rwanda | +250 | 
| Saba | +599 4 | 
| Saint Barthélemy | +590 | 
| Saint Helena | +290 | 
| Saint Kitts and Nevis | +1 869 | 
| Saint Lucia | +1 758 | 
| Saint Martin (France) | +590 | 
| Saint Pierre and Miquelon | +508 | 
| Saint Vincent and the Grenadines | +1 784 | 
| Samoa | +685 | 
| San Marino | +378 | 
| São Tomé and Príncipe | +239 | 
| Saudi Arabia | +966 | 
| Senegal | +221 | 
| Serbia | +381 | 
| Seychelles | +248 | 
| Sierra Leone | +232 | 
| Singapore | +65 | 
| Sint Eustatius | +599 3 | 
| Sint Maarten (Netherlands) | +1 721 | 
| Slovakia | +421 | 
| Slovenia | +386 | 
| Solomon Islands | +677 | 
| Somalia | +252 | 
| South Africa | +27 | 
| South Georgia and the South Sandwich Islands | +500 | 
| South Ossetia | +995 34 | 
| South Sudan | +211 | 
| Spain | +34 | 
| Sri Lanka | +94 | 
| Sudan | +249 | 
| Suriname | +597 | 
| Svalbard | +47 79 | 
| Sweden | +46 | 
| Switzerland | +41 | 
| Syria | +963 | 
| Taiwan | +886 | 
| Tajikistan | +992 | 
| Tanzania | +255 | 
| Telecommunications for Disaster Relief by OCHA was | +888 | 
| Thailand | +66 | 
| Thuraya (Mobile Satellite service) | +882 16 | 
| East Timor (Timor-Leste) | +670 | 
| Togo | +228 | 
| Tokelau | +690 | 
| Tonga | +676 | 
| Transnistria +373 2, | +373 5 | 
| Trinidad and Tobago | +1 868 | 
| Tristan da Cunha | +290 8 | 
| Tunisia | +216 | 
| Turkey | +90 | 
| Turkmenistan | +993 | 
| Turks and Caicos Islands | +1 649 | 
| Tuvalu | +688 | 
| Uganda | +256 | 
| Ukraine | +380 | 
| United Arab Emirates | +971 | 
| United Kingdom | +44 | 
| United States | +1 | 
| Universal Personal Telecommunications (UPT) | +878 | 
| Uruguay | +598 | 
| US Virgin Islands | +1 340 | 
| Uzbekistan | +998 | 
| Vanuatu | +678 | 
| Vatican City State (Holy See) | +39 06 698, | 
| assigned | +379 | 
| Venezuela | +58 | 
| Vietnam | +84 | 
| Wake Island, USA | +1 808 | 
| Wallis and Futuna | +681 | 
| Yemen | +967 | 
| Zambia | +260 | 
| Zanzibar | +255 24 | 
| Zimbabwe | +263 | 
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