Türk Telekom Group provides integrated telecommunication services for PSTN, GSM, and wideband Internet.

[citation needed] With its network substructure covering the whole country, the group's companies offer a wide range of services to personal and corporate customers.

Creditors set up a special purpose vehicle to acquire the company as they try to resolve Turkey's biggest-ever debt default.

[10] It provides ADSL, dial-up, Wi-Fi, G.SHDSL, ATM, Frame Relay, and Metro Ethernet Internet access services to corporate and personal customers in 81 cities in Turkey.

[14] AssisTT is Turkey's largest call center and provides its services to other corporations and institutions in addition to its parent company Türk Telekom.

100% of the shares of the company, which had started its activities in 2004, belong to Turk Telekomunikasyon A.S..[citation needed] AVEA, the sole GSM-1800 mobile operator of Turkey, was founded in 2004.

[citation needed] Offering services to 95.4% of Turkey's population through its network, The activities of SEBIT Eğitim ve Bilgi Teknolojileri A.Ş.

Active in corporate education, it has developed e-learning solutions[buzzword] for the institutions such as IES, Union of Banks of Turkey, Secretariat of Defense Industries, Public Procurement Agency, Coca-Cola, Migros, Siemens, and TTNET.

Cetel was incorporated as a special-purpose entity to acquire the 76% shares of Albtecom Sh.A, which is located in Albania and operates in the telecommunication industry.