India STD codes : Subscriber
trunk dialing codes
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The term "subscriber trunk dialling"
is used in the United Kingdom, the Republic of Ireland, Australia, India and
South East Asia .The corresponding term in the USA and Canada is direct distance
The introduction in the UK of subscriber dialing of long distance calls removed
the distinction that had existed between Trunk and Toll calls. This term
however, is still widely prevalent in India to describe any national call made
other than one's local unit. A "subscriber" is someone who subscribes to, i.e.
rents, a telephone line and a "trunk call" is one made over a trunk line, i.e. a
telephone line connecting two exchanges a long distance apart. Now that all
calls may be dialed direct, the term has fallen into disuse.
In the UK, STD call started on 5 December 1958 when the Queen, who was in
Bristol, dialed a phone call to Edinburgh – the furthest distance a call could
be directly dialled. The STD system was completed in 1979, though most of
the country was covered well before then. The system required that each area
have its own STD code which could be dialed by subscribers, and although they
are now officially called area codes, it is still common to see and hear the old
term in everyday use.
STD codes Based on States
List based on