Optima Telekom was created in 2004-11.
Deutsche Telekom was created in 1995.
Telekom Austria was created in 1996.
Telekom Srpske was created in 1996.
Eesti Telekom was created in 1993.
Türk Telekom was created in 1995.
Magyar Telekom was created in 1991.
Telekom Brunei was created in 2005.
TK Telekom was created in 2001.
Telekom Srbija was created in 1997-06.
Crnogorski Telekom was created on 1998-12-31.
T-Hrvatski Telekom was created in 1998.
Makedonski Telekom was created on 1997-01-01.