Government of Croatia initiated the privatization of the state-owned telecommunications company, Hrvatski Telekom, in 1998.

[2] In 2001, Hrvatski Telekom acquired Cronet, which was the second mobile operator in Croatia and the first to offer GSM network services in the country in 1996.

[4] [5] The company rebranded as T-HT on October 1, 2004, becoming part of the global T-family of Deutsche Telekom.

Mostar, known as HT Eronet, from the Government of the Federation of Bosnia and Herzegovina as part of the national telecom company's privatization process.

[8] By October 5, 2007, the Croatian government sold 32.5% of HT's shares through an IPO, reducing its stake to 3.5% by June 2008, with private and institutional investors then holding 38.5%.

[1] Hrvatski Telekom absorbed its subsidiary, T-Mobile, on January 1, 2010, creating a single unified company.

[1] In June 2014, HT acquired OT-Optima Telekom and subsequently held 19.1% of Optima's share capital.

By July 2021, HT and Zagrebačka banka agreed to sell their 54.31% stake in Optima to Telemach Hrvatska, finalizing the transfer in January 2022.