When calling a phone number in another country, there is usually a prefix you have to dial to indicate that you're placing an international call; this varies by country. After that international dialling prefix, you must dial the international country code for the country you are calling, followed by the local number. This is a list of those country codes.
Note: The entities that are within the North American Numbering Plan—the United States and its possessions, Canada, and several Caribbean nations—share the international "country" code 1, with each state (or parts of states), province, territory, or island nation given its own three-digit "area code". The following list includes the area codes for such nations outside the US and Canada, as well as those of US possessions outside of the United States proper.
Before dialling the area code, you usually have to dial an international prefix. This is so that the country code won't be confused with the first few digits of a local or national telephone number. Here is a list of common international prefixes:
|Digits dialled||Countries you are calling from|
|00||All European Union countries, plus Afghanistan, Argentina, Armenia, Azerbaijan, Bahamas, Central African Republic, Chad, Chile, China, Ecuador, Egypt, El Salvador, Ethiopia, Fiji, Georgia, India, Israel, Jordan, Kyrgyzstan, Lebanon, Macau, Malaysia, Mali, Mexico, Moldova, Nepal, New Zealand, North Korea, Pakistan, Peru, Philippines, Qatar, Saudi Arabia, South Africa, Turkey, Ukraine, Uruguay, Vietnam|
|001||Hong Kong, Indonesia, Singapore, South Korea, Thailand|
|011||All North American Numbering Plan countries|
|0021||Brazil (The Brazilian international prefix is 00- followed by a two-digit carrier code)|
|810||Belarus, Kazakhstan, Russia, Tajikistan, Turkmenistan, Uzbekistan|
On a mobile phone, you can instead dial the '+' key before the country code, regardless of which country you are calling from.