The International Telecommunication Union (ITU) has been working for many years on common standards among countries, including the numbering plans to promote, as they currently are various formats around the world.
However, recommendations of the ITU is not binding on the Member States, and in some countries like the United States and Canada - as well as the other countries participating NANP - after participating in this call. Australia is also among those who have not followedITU recommendation.
An international numbering plan would country codes, area code, that nations or groups would be represented by the nation.
One reason for this is that area codes are determined in general, what the cost for a particular call. Therefore, calls made within a specified area code and a small group of nearby, next to, or overlapping codes is usually too a lower rate than those a few miles before the area code case free of charge --although this is often not the case in Canada and the United States, where competition and regulation play many roles.
Open and closed dialing counties.
An open dialing plan occurs when long-distance and local calls require different rules. Therefore, if you call a number selected in the same city, must be only the number.
Other countries ... However, there are no dial-up plans ... Closed dialing plans are much rarer.They occur when a participant number is a standard length, and where it is used for all calls, even within the same area.
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