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How to call United States from Canada: 1 - Canada exit code. 1 + Area Code + Local Number-Overall dialing code format. Note: United States and Canada are both members of NANP (North American Numbering Plan) so when calling between these countries, 1 is used in place of the country exit code.ote: United States and Canada are both members of NANP (North American Numbering Plan) so when calling between these countries, 1 is used in place of the country exit code.
Secondly you then dial the INTERNATIONAL DIALING CODE and this is the number that specifies which country you are dialing. So you are right to say that the international dialing code for the USA is '1' (it is also the same for Canada).Your phone company then routes the remaining digits you dial to the country the number represents.Now comes the interesting bit-why '1' for USA and larger numbers (Like '44' for the United Kingdom) for other coutries. Its all to do with how your phone company routes calls to other phone companies.o you are right to say that the international dialing code for the USA is '1' (it is also the same for Canada). Your phone company then routes the remaining digits you dial to the country the number represents.