[citation needed] The formerly fully-state-owned firm (the government's National Pension Service currently owns 12.19% shares and is the largest shareholder) is South Korea's first telecommunications company and is a major supplier of the local landline and broadband internet market, serving about 90 percent of the country's fixed-line subscribers and 45 percent of high-speed Internet users.

The company's merger with KTF, its wireless subsidiary, in 2009 made it the country's ninth largest chaebol (conglomerate) with nearly 24 trillion won in assets as of 2009.

[4] Founded in 1981 as a public utility, KT played a major role in Korea's development in the information technology hub sector.

[5] In 2009, KT merged with its wireless subsidiary KTF, paving the way to the integration of landline and cellular services.

The current internal directors are Chang-Gyu Hwang (Chairman & CEO), Hyeon-myung Pyo and Il-yung Kim, and the external directors are Eung Han Kim (Board Chairman), Chun-Ho Lee, Hyun-nak Lee, Byong-won Bahk, Keuk-je Sung, Sang-Kyun Cha, Do-Kyun Song.

In the first half of 2011, KT launched the "Kibot", a robot specially developed for the education and entertainment of children.

KT launched the Mobile TV app, which enables customers to view live IPTV and video on demand on their smartphones and tablets.

KT connected the Moheshkhali Island to the inland areas by installing the wireless network technology ‘GiGA Microwave’ and used copper-based KT's providing giga-level internet solution ‘GiGA Wires’ to circulate network traffic within the island.

[56] In March 2013, KT signed a contract with the Rwandan government to establish the joint venture to build a nationwide mobile LTE network.

[57] On March 21, 2013, KT, Daewoo International Corporation, and the Korea Trade-Investment Promotion Agency (KOTRA) signed an $18 million contract to establish high-speed Internet network in Podlaskie, Poland.

[58] On October 3, 2013, the KT consortium signed a Public Private partnership (PPP) with the Mazowieckie province for a $130 million broadband project.

[66] Due to KT Wiz being a relatively new franchise and having a poor record for much of its early years, the "rivalry" was largely one-sided and given less attention compared to esports and basketball, where such match-ups are generally hotly contested affairs.

It-seop released the data on the speed test in the video, after which the controversy was published, and KT users repelled it.

[69] On April 19, 2021, KT explained that "the customer's information was incorrectly transferred due to an error in the process of moving the studio recently" and "For this reason, only 100 megabit would have been provided."