[1] Subscriber trunk dialling (STD) codes are assigned to each city, town and village.

The first-ever long-distance subscriber trunk dialing (STD) call in India was made between the cities of Kanpur and Lucknow in 1960.

No prefix is required to call from one landline to another within the same area code, as variable-length dialling rules apply.

There are many businesses in the Indian market who rent keywords on a monthly basis, whose characters on a typical mobile phone keypad represent short codes.

Telemarketers have been issued 10-digit telephone numbers starting with 140 (140XXXXXXX) by the Department of Telecommunications on TRAI's request.