Turk Telekom

Turk Telekom is the formerly state-owned Turkish telecommunications company. The Turk Telekom Group companies had 16.8 million PSTN customers, 6 million ADSL customers and 12.1 million GSM customers as of 2009 年 9 月 30 日. With its network substructure covering the whole country, the group's companies offer a wide range of services to personal and corporate customers.

http://www.turktelekom.com.tr