From eTripTips Wiki
This article is a travel topic.
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 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 United States, Canada, and several Caribbean nations technically share the international calling code +1, with each state, province, territory, or island nation given its own three-digit "area code".
