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A numbering plan is a plan used to distribute international telephone numbers between various continents and districts as well as among cell phone providers. There’s still a difference of dial plans (international calling codes) and numbering plans. Or there is a closed numbering plan used in areas like Canada or North America. For closed plan it is supposed that there are local phone numbers together with special length territory codes.

There also exists an open numbering plan used in different lands that haven’t unified it yet. In this plan the size of the area dialing code and subscriber’s number can change. All numbers formed by the open plan are dialed differently. You have to be aware which digits are to be always dialled (they complete the local telephone number) and which can be omitted (dialing codes).
In spite of the attempts of the International Telecommunication Union or ITU to carry out the norms of numbering plans and international calling codes they anyway stay different in various regions. The organization desided to have double zero as a general international access combination for all the participating countries. Despite that it was entered by several countries the other members like USA, Canada and different nations keeping to the North American Numbering Plan desided not to change the present calling codes. Missed the idea? Try brand reverse phone directory!

The international numbering plan lets arrange country codes that suppose the dialing code for one or a group of nations. Specially to regulate the codes for international calls there is the E.164 rule set. It states the normal extension of the dialled number. It is anyway supposed that the region itself defines the numbers on its land. District area codes then can exist with:

- A fixed extension, including for example one digit in Australia or three in USA.
- The extension that is not assigned so that it differs from one up to two in Syria, from one to five in Japan or from two to 5 in Austria or Germany or some other way.

- The area dialing code inserted into the number itself. It’s actively used in several areas like Spain or Norway. So are the pecularities of the so-called closed numbering plan. Speaking of some nations, they have zero as a long-distance dialling code. It’s popular in countries like Italy, Switzerland, South Africa or others.

The calling code of the area generally lets charge the subscriber for calls rightly. Usually calling on the telephone numbers within your area dialing code is really cheaper than calling on the telephone numbers with some other area dialing code.

Still it is usually the other way in the USA as there the rates for home calls are defined by the state representatives so the costs frequently happen to be higher than for trunk connection.

As it happens that in the USA the distance between the callers of one vast area can be too big, the calls are charged according to the interval though the calling code is the same.

The rate centers usually assign costs for territory sections counted in parts of about 6, twelve or more miles. But it went the other way with the deregulation of home telephone services.

Today it’s going popular between the subscribers to take the so-called “all-you-can-eat” plan (an assigned rate of nearly $30 per month as actual for May 2008 letting connect with any part of States).
In several regions mobile phone systems apply particular calling codes. Also they are used for some exceptional rates, free or premium accounts.

There as well can be some special variants. For example in areas like Egypt dialling codes define nothing because the costs remain the same for the whole territory and in Great Britain the area dialing code is made of 2 parts each with its cost.