1902 – First wireless telegraph station established between Saugor Islands and Sandheads.
1907 – First Central Battery of telephones introduced in Kanpur.
1913-1914 – First Automatic Exchange installed in Shimla.
July 23, 1927 – Radio-telegraph system between the UK and India, with beam stations at Khadki and Daund, inaugurated by Lord Irwin by exchanging greetings with the King of England.
1933 – Radiotelephone system inaugurated between the UK and India.
1953 – 12 channel carrier system introduced.
1960 – First subscriber trunk dialing route commissioned between Kanpur and Lucknow.
1975 – First PCM system commissioned between Mumbai City and Andheri telephone exchanges.
1976 – First digital microwave junction introduced.
1979 – First optical fibre system for local junction commissioned at Pune.
1980 – First satellite earth station for domestic communications established at Secunderabad, A.P..
1983 – First analog Stored Program Control exchange for trunk lines commissioned at Mumbai.
1984 – C-DOT established for indigenous development and production of digital exchanges.
1985 – First mobile telephone service started on non-commercial basis in Delhi.