Optima Telekom was created in 2004-11.
Magyar Telekom was created in 1991.
Telekom Austria was created in 1996.
Eesti Telekom was created in 1993.
Telekom Srpske was created in 1996.
Türk Telekom was created in 1995.
TK Telekom was created in 2001.
Telekom Brunei was created in 2005.
Deutsche Telekom was created in 1995.
Telekom Srbija was created in 1997-06.
Türk Telekom B.K. was created in 1991.
Türk Telekom GSK was created in 1954.
Telekom Baskets Bonn was created in 1992.