Exhibit C

JOINT FILING AGREEMENT

The undersigned hereby agree that the Statement on Schedule 13D with respect to the Ordinary Shares, TRY 0.001 nominal value per share, of Turkcell Iletisim Hizmetleri A.S., dated as of December 5, 2005, is, and any further amendments thereto (including amendments on Schedule 13G) signed by each of the undersigned shall be, filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the United States Securities Exchange Act of 1934.

CUKUROVA TELECOM HOLDINGS LIMITED

December 5, 2005

Date

/s/ Oleg Malis

Signature

Oleg Malis, Director

Name/Title

ALFA TELECOM TURKEY LIMITED

December 5, 2005 Date

/s/ Pavel Nazarian

Signature

Pavel Nazarian, Director
Name/Title

ALFA FINANCE HOLDINGS S.A.

December 5, 2005

Date

/s/ Pavel Nazarian

Signature

Pavel Nazarian, Attorney

Name/Title

CTF HOLDINGS LIMITED

December 5, 2005

Date

/s/ Franz Wolf

Signature

Franz Wolf, Director

Name/Title

CROWN FINANCE FOUNDATION

December 5, 2005

Date

/s/ Franz Wolf

Signature

Franz Wolf, Attorney

Name/Title