Main companies
Telekom Deutschland | Electronic Beats | Hrvatski Telekom (Crnogorski Telekom (76.53%) | HT Mostar (39.1%)) | Magyar Telekom | Makedonski Telekom | OTE (40%) | Slovak Telekom | BT Group (12%) | Magenta Telekom
Main services
Telekom Web&Mobile TV | T-Home | T-Mobile | T-Online | T-Systems | TVision (United States)
Mobile networks
Telekom: Croatia | Germany (Congstar) | Hungary | Montenegro | North Macedonia | Slovakia
T-Mobile: Czech Republic | Poland | United States | Metro by T-Mobile (United States)
Television channels (via OTE)
Cosmote Cinema | Cosmote Sport
Other brands
Austria: Magenta
Greece (via OTE): Cosmote (TV) | Frog Mobile
United Kingdom: EE (via BT Group)2
Romania: Combridge
Absorbed companies
MobileStar | Omnipoint Communications | Powertel | SunCom | VoiceStream Wireless | Western Wireless Corporation | UPC Austria | Layer3 TV | Sprint
Former brands
T-Basis | T-BasisNet | T-Card | T-MobilNet | T-Net | T-Profi | T-ProfiNet | T-SystemNet
Germany: Joyn
Romania: Telekom Romania Mobile Communications8 (Cartela Telekom) | Dolce | Joyn | Telekom TV7 | Zapp | Frog Mobile | Cosmote MyTab
Bulgaria: Globul | Frog Mobile
Hungary: T-Mobile | Westel 0660
Former subsidiaries
United Kingdom: T-Mobile UK2 | Bulgaria: Globul3 | North Macedonia: Cosmofon4 | Albania: Telekom Albania5 | Philippines: Innove Communications6 | Romania: Telekom Romania (Telekom Sport7 (1 | 2 | 3 | 4 | 5 | 6) | Telekom Info7)< (54% via OTE)7 | Netherlands: T-Mobile Nederland1 (Ben, Tele2)
Notes:
1Co-owned with Tele2.
2Deutsche Telekom holds a 12% stake in BT Group, the present owner of EE. EE was formed by the merger of T-Mobile UK and Orange (UK).
3Acquired by Telenor. Now part of PPF Group.
4Acquired by Telekom Slovenije. Now part of A1 Telekom Austria Group.
5Acquired by Vivacom (which was acquired by United Group).
6Sold to Globe Telecom.
7Sold to Orange S.A..
8Sold to Clever Group.
| 
Logopedia
