Telephone numbers in India 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. For example, Tier-2 Cities or culturally significant towns in India have STD code with 3 digits. For example, Kanpur and Lucknow were the two cities between which the
Telephone numbers in Singapore M1 and StarHub, do not offer any special dialling arrangements for calling to Malaysia and Indonesia, instead requiring full international dialling, the same as calling other countries. 3xxx xxxx - Business and Corporate IP Telephony Services 6xxx xxxx - Public Switched Telephone Network (PSTN) and Residential IP Telephony Services 8zxx xxxx - Mobile and Data Services 9yxx xxxx - Mobile, Data Services and Pager (until May 2012) 800 xxx xxxx - Toll-free international services 1800 xxx xxxx - Toll-free domestic services (Free if calling from a landline. Airtime charges apply if calling from a mobile line.) 1900 xxx xxxx -