This is the code you need to use when dialing to that particular country from another country. The International Telecommunications Union assigns 1-, 2-, or 3-digit country calling codes for international telephone calls. The calling code "1" is assigned to the entire North American Numbering Plan Area, which includes the U.S. and its possessions, Canada, Bermuda and nations of the Caribbean. Within this region the "1" is followed by a NANPA 3-digit area code. Also, code "7" is assigned to a large calling area including the Russian Federation and Kazakhstan. All other countries and territories have their own 2-digit or 3-digit code.