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.
UK telephone code misconceptions a one. This change makes about 200,000 new numbers available for each area code in which the change has been made. Some telephone service providers differentiate ordinary calling costs using the relevant area code(s). Until STD was introduced, only telephone operators could connect calls over the trunks (long distance links between major exchanges). A subscriber would have to dial 0 for the operator and then request a long distance call. As STD was introduced area by area the meaning of the 0 changed; it was now the trunk prefix used to raise a call automatically to the trunk dialling level,