Country calling codes

A country code designates a sequence of numbers which is used to make an international call. It preceeds the national dialing code following by the phone numbers of the receiver. Example : USA country code is 1 and Scotland country code is 44 like England, North Ireland and Wales. The IDD acronym is International direct dialing. It is an access code or call prefix to dial before country code. The process to dial internationally is : first dial the IDD for the country one is in, Then dial the country calling code for the country one wishes to call, followed by the phone number of the receiver. (IDD is called ISD which is the acronym of International Subscriber Dialing ) The IDD in many European and Africain countries is "00" whereas in the American continent IDD may be different from a country to another. For telephone calls to foreign countries, beginning with two zeros is commonly used to all international area codes and can be replaced by "+" like this :
To call France : either you dial 0033 or +33 and then phone number.