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Map showing connection codes (prefix connection) of continents around the world

An international telephone number, International Code or state key, is a sequence consisting of one, two or three decimal digits (0-9); it is used when communicating between states, so that each state identifies a special number; when calling a state - the caller dials the number of the state concerned, followed by the area number and then the target telephone number; the dialing process requires the international line to be opened first - this varies from state to state, although in 33 states it is common for two consecutive zero: 00 to be dialed first.

Standard formula for telephone numbers as defined by ITU standard E.164 is: phone number (Area number\Network) + country number.

Example of a phone number in Cairo: ××××3508 (2) 20+، where Egypt number 20 and Cairo number 2. Example of a phone number in Ramallah: ××××295 (2) 970+، where Palestine number 970 and Ramallah number 2.

There are exceptions in the number used to start the international dialing service according to the following table, where it is not required to add zero to the left of the number:

See the international call keys list article, to view the list of all international call keys.

Brief overview
The international dialing code is a start code, so the dialing can be organized in a tabular sequence: each row of the table below finds the country codes in the leftmost column field so that the same number appears first, and then later in the columns the second number is inserted in ascending order.

The following is a list of countries of the world and the number used to call them :