Telephone numbers in India operator as well as the service and the company. Telemarketers have been issued 10-digit telephone numbers starting with 140 (140XXXXXXX) by the Department of Telecommunications on TRAI's request. Telephone numbers in India Telephone numbers in India are administered under the "National Numbering Plan of 2003" by the Department of Telecommunications. The numbering plan was last updated in 2015. The International Telecommunication Union has assigned the country calling code "91" to India. Subscriber Trunk Dialling (STD) codes are assigned to each city/town/village, with the larger Metro cities having shorter area codes (STD codes), which are from 2 to 8 digits long.
Premium-rate telephone number the subscriber agreed to the charges has also been largely closed by more stringent regulation. SMS also has a feature for premium rate services. They generally do not use 900 numbers, but instead use five-digit and six-digit numbers, shorter than a telephone number. Premium rate numbers in Mexico are served by Telmex and start with the dialling prefix 01-900, where 01 is the domestic long distance prefix and 900 is the premium-rate area code. These numbers are usually used for the same purposes as in the United States. Telephone numbers of the form 0600-xxx-xxxx and 0609-xxx-xxxx are premium rate numbers.