Telkom is one of the world’s oldest telecommunication companies. The company can be traced back to the establishment of the first electromagnetic telegraph service in Indonesia on 23 October 1856, by the Dutch colonial government to connect Batavia (Jakarta) and Buitenzorg (Bogor).

Telephone service was introduced to Indonesia by private companies in 1882, and by 1906, all postal and telegraph services in Indonesia were taken over by the government as a single, unified government agency named Post, Telegraph and Telephone Service (Post, Telegraph, and Telephone Service – PTT).

After years of war, PTT was nationalized in 1949 and split into two state-owned companies, PN Pos Giro, responsible for providing mail services, and PN Telekomunikasi, a telecommunications service in 1969.

In 1974, PN Telekomunikasi was further divided into two state-owned companies. Perusahaan Umum Telekomunikasi (Perumtel) provided domestic and international telecommunications services, while PT Industri Telekomunikasi Indonesia (PT INTI) manufactured telecommunications equipment.  In 1991, Perumtel became a state-owned limited liability corporation and renamed to what is now Perusahaan Perseroan (Persero) PT Telekomunikasi Indonesia or Telkom

Telkom Indonesia is a dominant and largest provider of fixed line services due to owning most of Indonesia’s copper network. Telkom Indonesia is the parent company of Telkom Group, operating in a wide range of businesses including telecommunications, information, multimedia, real estate and financial services. Currently, Telkom is responsible for about 9 million landline phone lines and about 120.5 million mobile phone accounts.

According to Wikipedia and telkom.co.id