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STD code stands
for Subscriber Trunk Dialing code. It is the same as Area
Code in US. It is fixed before telephone numbers in case the
location of exchange is different for the caller and receiver. A
telephone number consists of ten digits in India, excluding the
country code. In case of mobile phones the whole ten digits are
allocated to a single subscriber but in case of fixed line or
land line phone an STD code is required to be fixed before the
6,7 or 8 digit subscriber number. STD codes can vary in
length from two digits to four digits. STD codes along with
the subscriber number never exceed ten digits in total. Fixed
telephone numbers in India follow the format: +91-<STD
Code>-<Subscriber Telephone number>. In the format 91 is the
country code of India, followed by the STD or Area code and
subscriber telephone number.
STD codes can be used
to help find the location of the telephone number. Any fixed
phone number can be traced to it’s location using the complete
ten digit phone number. One important point to note is that
whiling dialing, from the area to another subscriber in the same
area, from a fixed phone STD code is not required for calling.
But in case of calling from a mobile device STD code is always
required to be pre-fixed before the telephone number. Also while
calling from within India STD codes need to be pre-fixed with
zero.
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