All consumer related services and brands were placed under Nuuday, and the ownership and maintenance of physical infrastructure of mobile antennas as well as coax and fibre optical lines were placed under TDC NET.

In 1879, Kjøbenhavns By- og Hustelegraf was established by telegraph engineer Severin Lauritzen and telegraphist Th.

In January 2000, TDC got a new logo with five ovals in red, yellow, green, turquoise and blue colour.

[citation needed] In 2006 TDC adopted a new logo which consists of a cursive rounded-rectangle in blue colour.

A group of private equity firms under the banner Nordic Telephone Company (NTC) offered to buy TDC for a price of about 9.1 billion Euro.

Also in 2006, TDC pulled out of the UK mobile telephone market, with the closure of their joint venture with EasyGroup, EasyMobile,[6] which had launched in 2004.

[16][17] A week later, a takeover bid from the Australian infrastructure group Macquarie and three Danish pension funds; PFA, PKA and ATP was leaked to the public, which TDC had rejected.

[22] In early April, the consortium announced they had acquired more than 90% of the total shares of TDC Group, making a delisting possible.

[23] On 20 January 2020, TDC announced that their lower-cost flanker brand Fullrate would be shut down and the customers be migrated to YouSee.