| Year | Detail |
| 1995 |
Deutsche Bundespost Telekom, a public sector company, becomes Deutsche Telekom AG. In response to globalization, Deutsche Telekom begins entering into partnerships and joint ventures worldwide, on a significant scale. |
| 1996 |
T-Mobile introduces the Skyper paging service. It supports text-message transmissions of up to 80 characters, It is an innovative information service, with a wide range of user-selectable informational channels, for mobile users. |
| 1997 |
It has launched its first prepaid card and the process of digitalizing the company's network in Germany is completed. |
| 1998 |
Deutsche Telekom AG launches a pilot project for broadband multimedia applications, in cooperation with the state of North Rhine-Westphalia (NRW) and the initiative "NRW Broadband" (Breitband.NRW). |
| 1999 |
Establishment of Kabel Deutschland GmbH. Launched the fast T-DSL data service is provided with ADSL technology, and via the copper wire pairs found in normal telephone lines. Deutsche Telekom acquires the British mobile network operator One 2 One. |
| 2000 |
It increases its stake in max.mobil, an Austrian mobile-network operator, to 100 percent. In addition, it acquires a majority stake of 60 percent in Matáv, a Hungarian company, and it gains a majority stake in Slovenské Telekomunikácie (Slovakia). |
| 2001 |
The Deutsche Telekom Group introduces a structure comprising the four divisions T-Com, T-Systems, T-Mobile and T-Online. |
| 2003 |
Deutsche Telekom's subsidiary T-Com launches its own brand presence. Deutsche Telekom divests itself of its cable business. |
| 2004 |
Establishment of Deutsche Telekom Stiftung. Deutsche Telekom and the university TU Berlin (Technische Universität Berlin) jointly establish the university-affiliated institute Telekom Innovation Laboratories (T-Labs), as a public-private partnership. |
| 2005 |
T-Systems acquires gedas AG from Volkswagen. In October 2004, Deutsche Telekom announces its plan to merge its subsidiary T-Online International AG with the Deutsche Telekom parent company. |
| 2006 |
The private-equity company Blackstone purchases 192 million Deutsche Telekom shares from KfW (Kreditanstalt für Wiederaufbau). |
| 2008 |
DT acquires a stake in the Greek company OTE. DT moves forward with broadband expansion. |
| 2009 |
Deutsche Telekom restructures itself. The organizational separation between fixed-network and mobile-network services is eliminated, and the company's product development, IT and technology areas are consolidated on a Europe-wide basis. |
| 2010 |
It has acquired Polish mobile communications company Polska Telefonia Cyfrowa (PTC). |
| 2011 |
The Polish mobile network operator PTC is renamed "T-Mobile Polska. Fiber-optic network expansion launched at CeBIT. |
| 2012 |
Merger between T-Mobile USA and Metro PCS. |
| 2014 |
Deutsche Telekom opens a high-performance data center in Biere, in the state of Saxony-Anhalt. |
| 2016 |
It has launched the Open Telekom Cloud. The Open Telekom Cloud combines flexibly available IT resources with service and rigorous German data protection standards. |
| 2017 |
T-Mobile Austria acquired the company UPC Austria. As a result, Deutsche Telekom is now also present in Austria with an integrated product portfolio covering internet, cable TV, and fixed and mobile services. |
| 2020 |
Deutsche Telekom launches the new T-Mobile US. |
| 2021 |
Deutsche Telekom and Tele2 sell T-Mobile Netherlands to a consortium of Apax and Warburg Pincus. |
| 2023 |
It has established its own civil engineering company to ensure further acceleration of the network build-out. |
| 2024 |
Telekom, in partnership with Intelsat and Skylo, is launching its first commercial satellite-based connectivity offering. |