Ø 1850 : Electric Telegraph Lime between Calcutta and Diamond Harbor, used by East India Company.
Ø 1853 : Telegraph branch under Posts and Telegraph Department, British India.
Ø 1853 : 4000 miles telegraph lines constructed in India.
Ø 1855 : Telegraph service opened to public in India.
Ø 1858 : India- Srilanka telegraph cable laid.
Ø 1885 : Telegraph Act.
Ø 1886 : Copper wire replacing iron wire.
Ø 1895 : Phonogram introduced in India.
Ø 1902 : Wireless Telegraphy started in India.
Ø 1914 : Postal and Telegraph departments merged in India
Ø 1933 : Wireless Telegraphy Act.
Ø 1949 : Introduction of Hindi script telegram.
Ø 1962 : Reconstructed as Pakistan Telegraph and Telephone Department.
Ø 1971 : Reconstructed as Bangladesh Telegraph and Telephone Department under Ministry of Posts and Telecommunications.
Ø 1975 : Reconstructed as Telegraph and Telephone Board.
Ø 1979 : Reconstructed as Bangladesh Telegraph and Telephone Board (BTTB) with right to issue license for telecom and wireless services.
Ø 1981 : Digital Telex Exchange in Bangladesh.
Ø 1983 : Automatic Digital ITX started in Dhaka.
Ø 1985 : Coinbox Telephone service introduced in Bangladesh by BTTB.
Ø 1989 : GENTEX Telegraph messaging service introduced in Bangladesh.
Ø 1989 : Bangladesh Rural Telecom Authority got license to operate exchanges in 200 upazilla.
Ø 1989 : Sheba Telecom got license to operate exchange is 199 upazilla.
Ø 1989 : Cellular mobile phone4 company Pacific Bangladesh Telephone Limited and Bangladesh Telecom got license.
Ø 1995 : Card Telephone service introduced in Bangladesh by BTTB and TSS.
Ø 1995 : Regulatory power of BTTB transferred to Ministry (MoPT).
Ø 1995 : 2nd and 3rd ITX installed in Dhaka.
Ø 1996 : Grameen Phone got cellular mobile Telephone license.
Ø 1996 : Telecom Malaysia International Bangladesh got cellular mobile license.
Ø 1998 : Telecom Policy.
Ø 2000 : Global Telecom Service (GTS) Telex Exchange venture with British Telecom.
Ø 2001 : Telecommunication Act, to establish Bangladesh Telecommunication Regulatory Commission (BTRC).
Ø 2002 : ICT Policy.
Ø 2004 : Teletalk cellular mobile launched.
Ø 2006 : NGN introduced in BTTB.
Ø 2008 (1 July) : Converted into Bangladesh Telecommunications Company Limited (BTCL) with 100% shares owned by Government and with 9 directors, headed by secretary of Ministry of Post and Telecommunications.
