STD codes stand for ‘Subscriber Trunk Dialing’ it also stands for ‘Subscriber Toll Dialing’. These codes were made for the convenience of the subscriber, who could make a long distance call without the assistance of an Operator. In the United Kingdom the use of STD codes first started when the Queen who resided in ‘Bristol wanted to make a call to ‘Edinburgh’. This call was made on the 5th of December, 1958. From the 8th of March 1963 subscribers could make ISD (International Subscriber Trunk Dialing).
However it took 21 years for the entire STD system to be completed. It was completed in the year 1979. The term STD (Subscriber Trunk Dialing) is used in countries like India and Australia. Whereas in the United States of America and Canada the term used instead of STD is ‘Direct Distance Dialing’.
Have you ever heard about IDD.......?
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