1976 Shakti Nagar (74) exchange commissioned. Idgah-II (52) X-Bar exchange inaugurated by Mr. Fakhuriddin Ali Ahmed, President of India, on 28.8.76 and presided over by Mr S.D. Sharma (Minister of Communications).
Opening of Shahdara East (20) Extension-I, X-Bar exchange on 31.8.76. It was inaugurated by Mr H.K.L Bhagat (Minister of State for Works & Housing) and Mr S.D. Sharma (Minister of Communications).
Opening of Hauz Khas (65) X-Bar exchange on 18.10.76. It was inaugurated by Mr S.D. Sharma (Minister of Communications) and presided over by Mr Radha Raman (Chief Executive Councillor, Delhi).
1977 Opening of STD Service to Indore and Ambala on 5.10.77 by Mr Brij Lal Verma (Minister of Communications).
1978 Opening of Rajouri Garden-I (59) X-Bar exchange in Feb 78
Opening of Hauz Khas -II (66) X-Bar exchange on 15.2.78, by Mr Brij Lal Verma (Minister of Communications).
Opening of Janpath-V (35) X-Bar exchange.
Opening of Nehru Place (68) Strowger exchange on 4.11.78 by Mr Brij Lal Verma (Minister of Communications) and presided over by Mr R.K. Gupta (Mayor of Delhi).
1986 Creation of Mahanagar Telephones Nigam Limited
1986 First digital exchange world technology brought to India
1987 Largle Scale introduction of push button telephone made dialling easier.
1988 Phone Plus services multiplied benefits to telephone users.
1992 Voice Mail Service Introduced
1995 Internet Introduced in India starting with Laxmi Nagar, Delhi 15 August 1995.
1996 ISDN services were launched.
1996 ISDN services introduced
1997 Wireless in Local loop introduced
1997 WLL service was launched
1999 Internet services introduced.
1999 Launch of Internet services
2000 Millennium Telecom Limited, a wholly owned subsidary of MTNL is born
2000 Millennium Telecom Ltd, a wholly owned subsidiary of MTNL is born to lay international submarine OF cable.
2001 Launched GSM Cellular Mobile service under the brand name Dolphin
Launched WLL Mobile services under the brand name Garuda.
The company listed at New York stock exchange(NYSE)
United telecom ltd.,MTNL Joint venture in Nepal,for providing WLL based services in Nepal became operational.
CLI based Internet express services introduced.
2001 Launch of GSM Mobile services, Launch of WLL mobile service, Listing of MTNL at NYSE, started operation of CDMA-1X WLL services in Nepal through joint venture company UTL, launch of CLI based internet service.
2002 Launched pre-paid GSM Mobile services under the brand name Trump.Email on PSTN lines introduced under the brand name mtnlmail.
2003 Introduced CDMA 1x 2000 Technology under the brand name Garuda 1-x.Introduced pilot project of ADSL based Broadband services.Introduced Virtual Phone services.Mahanagar Telephone Mauritius Ltd. bagged second operator license in Mauritius.
2003 Launch of CDMA-1X 2000 services, ADSL based pilot project for providing broad band services.
2003 Mahanagar Telephone Mauritius Limited (MTML) a 100%subsidiary company of MTNL was incorporated as a private domestic company Mauritius.
2004 Expanded GSM & CDMA capacity by 800,000 lines each (total 1.6 million lines expanded) STD/ISD rates slashed by almost 60%. MTNL subsidiary MTML obtained license to provide fixed, mobile & ILD services in Mauritius. Launched Wi-Fi & digital certification services. State of the art training centre CETTM commissioned.
2004 Obtained fixed, mobile and ILD services license in Mauritius. Started Digital certification services, Commercial launch of broadband services.
2005 Leading market in GSM customer additions. Launched broadband services under the brand name TRI BAND. Floated tender for 1 million 3G GSM lines.
2005 The broad band services using ADSL 2+ technology was launched in January 2005
2006 Launched IPTV Service in November 2006. WiMAX deployment started. WCDMA 3G service’s equipment procurement started, Pilot launch of Wi MAX service begin.
2008 First time in India, launched 3G Mobile Service.