Check out STD codes of major cities of Tamil Nadu, India.
Here is a complete list of STD Codes of different cities of Tamilnadu. STD stands for Standard 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 (I SD- International Subscriber Dialing ), then the ISD code of India (091) would be prefixed before the district code and the phone number (0091- 44- 12345678).
