Here
is a complete list of STD Codes of different cities of Tamilnadu. STD
stands for Subscriber Trunk Dialing. When you are dialing from
outside the district then you will have to prefix the phone number with
the STD code of the district (044- 12345678 for Chennai) and in case of
making calls from outside India (ISD- International Subscriber
Dialing), then the ISD code of India (091) would be prefixed
before the district code and the phone number (0091- 44- 12345678).
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