INTERNATIONAL DIRECT DIALLING

'International Direct Dialling' (IDD) is the term used to describe an international telephone call dialled by the caller rather than going via an operator (see list of country calling codes). The term 'International Subscriber Dialling' (ISD) was used in the United Kingdom until the terminology was changed to International Subscriber Dialling.

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See also

See also

★ Subscriber trunk dialling

★ International Subscriber Dialling (India)