IMPORTANT NOTICE THIS OFFERING IS AVAILABLE ONLY TO INVESTORS WHO ARE EITHER (1) QIBS (AS DEFINED BELOW) OR (2) PERSONS OTHER THAN U.S. PERSONS (AS DEFINED IN REGULATION S UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”)) LOCATED OUTSIDE OF THE UNITED STATES IMPORTANT: You must read the following disclaimer before continuing. The following disclaimer applies to the attached offering circular (the “Document”) following this page and you are therefore advised to read this disclaimer carefully before reading, accessing or making any other use of the attached Document. In accessing the attached Document, you agree to be bound by the following terms and conditions, including any modifications to them from time to time, each time you receive any information from the Issuer or the Joint Lead Managers (as defined in the Document) as a result of such access. NOTHING IN THIS ELECTRONIC TRANSMISSION CONSTITUTES AN OFFER OF SECURITIES FOR SALE IN THE UNITED STATES OR ANY OTHER JURISDICTION IN WHICH IT IS UNLAWFUL TO DO SO. THE NOTES HAVE NOT BEEN, AND WILL NOT BE, REGISTERED UNDER THE SECURITIES ACT, OR THE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR OTHER U.S. JURISDICTION, AND THE NOTES MAY NOT BE OFFERED OR SOLD, DIRECTLY OR INDIRECTLY, WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS (AS DEFINED IN REGULATION S UNDER THE SECURITIES ACT) EXCEPT PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND APPLICABLE STATE OR LOCAL SECURITIES LAWS. THE ATTACHED DOCUMENT MAY NOT BE FORWARDED OR DISTRIBUTED IN WHOLE OR IN PART TO ANY OTHER PERSON AND MAY NOT BE REPRODUCED IN ANY MANNER WHATSOEVER AND, IN PARTICULAR, MAY NOT BE FORWARDED TO ANY U.S. ADDRESS. ANY FORWARDING, DISTRIBUTION OR REPRODUCTION OF THIS DOCUMENT IN WHOLE OR IN PART IS UNAUTHORIZED. FAILURE TO COMPLY WITH THIS DIRECTIVE MAY RESULT IN A VIOLATION OF THE SECURITIES ACT OR THE APPLICABLE LAWS OF OTHER JURISDICTIONS. IF YOU HAVE GAINED ACCESS TO THIS TRANSMISSION CONTRARY TO ANY OF THE FOREGOING RESTRICTIONS, YOU ARE NOT AUTHORIZED AND WILL NOT BE ABLE TO PURCHASE ANY OF THE SECURITIES. Confirmation of your representation: In order to be eligible to view the attached Document or make an investment decision with respect to the securities being offered, prospective investors must be either (1) Qualified Institutional Buyers (“QIBs”) (within the meaning of Rule 144A (“Rule 144A”) under the Securities Act) or (2) a person other than a U.S. person (as defined in Regulation S under the Securities Act) located outside the United States. This Document is being sent to you at your request, and by accepting the email and accessing this Document you shall be deemed to have represented to the Issuer and the Joint Lead Managers that (1) either (a) you and any customers you represent are QIBs or (b) you are a person other than a U.S. person (as defined in Regulation S under the Securities Act) located outside the United States and you are purchasing the securities being offered in an offshore transaction (within the meaning of Regulation S under the Securities Act) and the electronic mail address that you gave us and to which this email has been delivered is not located in the United States, and (2) you consent to delivery of such Document by electronic transmission. You are reminded that this Document has been delivered to you on the basis that you are a person into whose possession this Document may be lawfully delivered in accordance with the laws of the jurisdiction in which you are located and you may not, nor are you authorized to, deliver or disclose the contents of this Document to any other person. The materials relating to this offering of securities do not constitute, and may not be used in connection with, an offer or solicitation in any place where offers or solicitations are not permitted by law. If a jurisdiction requires that this issuance of securities be made by a licensed broker or dealer, and the Joint Lead Managers or any affiliates of the Joint Lead Managers is a licensed broker or dealer in the relevant jurisdiction, this offering shall be deemed to be made by the Joint Lead Managers or such affiliates on behalf of the Issuer in such jurisdiction. The attached Document may only be distributed to, and is only directed at (a) persons who have professional experience in matters relating to investments falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (the “Order”), (b) high net worth bodies corporate falling within Article 49(2) of the Order, and (c) any other persons to whom it may otherwise lawfully be communicated (all such persons together being referred to as “relevant persons”). Any person who is not a relevant person should not act or rely on this Document or any of its contents. The attached Document has been sent to you in an electronic form. You are reminded that documents transmitted via this medium may be altered or changed during the process of electronic transmission and consequently none of the Issuer or the Joint Lead Managers, any person who controls them or any director, officer, employee or agent of them or affiliate of any such person accepts any liability or responsibility whatsoever in respect of any difference between the Document distributed to you in electronic format and the hard copy version available to you on request from the Joint Lead Managers. Please ensure that your copy of the attached Document is complete. You are responsible for protecting against viruses and other destructive items. Turkcell İletişim Hizmetleri A.Ş. (incorporated as a joint stock company (anonim şirketi) with limited liability in the Republic of Turkey) $500,000,000 5.800% Notes due 2028 Turkcell İletişim Hizmetleri A.Ş., a public joint stock company (the “Issuer” and, together with its consolidated subsidiaries, “Turkcell” or the “Group”), is issuing $500,000,000 5.800% Notes due 2028 (the “Notes”). Interest on the Notes will be paid in arrear on the 11th day of each April and October, provided that if any such date is not a Business Day (as defined below), then such payment will be made on the next Business Day. Principal of the Notes is scheduled to be paid on April 11, 2028 but may be paid earlier under certain circumstances as further described herein. The Notes initially will be sold to investors at a price equal to 97.779% of the principal amount thereof. For a more detailed description of the Notes, see “Terms and Conditions of the Notes”. INVESTING IN THE NOTES INVOLVES RISKS. PROSPECTIVE INVESTORS SHOULD CONSIDER THE FACTORS SET FORTH UNDER “RISK FACTORS” BEGINNING ON PAGE 30 OF THIS OFFERING CIRCULAR. This Offering Circular (the “Offering Circular”) has been approved by the Central Bank of Ireland, as competent authority under Directive 2003/71/EC (the “Prospectus Directive”) as amended. The Central Bank of Ireland only approves this Offering Circular as meeting the requirements imposed under Irish and EU law pursuant to the Prospectus Directive. Application has been made to the Irish Stock Exchange plc trading as Euronext Dublin (“Euronext Dublin”) for the Notes to be admitted to the official list of Euronext Dublin (the “Official List”) and to trading on its regulated market (the “Main Securities Market”). Such approval only relates to Notes which are to be admitted to trading on a regulated market for the purposes of Directive 2014/65/EU and/or which are to be offered to the public in any Member State of the European Economic Area. References in this Offering Circular to the Notes being “listed” (and all related references) will mean that the Notes have been admitted to the Official List and have been admitted to trading on the Main Securities Market. The Main Securities Market is a regulated market for the purposes of Directive 2014/65/EU. Application has been made to the Capital Markets Board of Turkey (the “CMB”) in its capacity as competent authority under the Capital Markets Law of the Republic of Turkey, Law No. 6362 dated December 6, 2012 (the “Capital Markets Law”) for the issuance and sale of the Notes by the Issuer outside Turkey. The Notes may not be sold outside Turkey before the necessary approvals and an approved issuance certificate (ihraç belgesi) have been obtained from the CMB. The CMB approved the issuance certificate (ihraç belgesi) dated March 22, 2018 and numbered 44/BA-428 by its letter dated March 22, 2018 and numbered 29833736-105.02.02-E.3344, based upon which the offering of the Notes will be conducted, and the written approval of the CMB relating to the issue of the Notes (which may be in the form of a tranche issuance certificate (tertip ihraç belgesi)) is expected to be obtained from the CMB on or before the Issue Date (as defined below). The withholding tax rate on interest payments in respect of Turkish bonds issued outside of Turkey varies depending on the original maturity of such bonds as specified under the Council of Ministers’ Decree No. 2009/14592 dated January 12, 2009 which has been amended by Decree No. 2010/1182 dated December 20, 2010 and Decree No. 2011/1854 dated April 26, 2011 (the “Decrees”). Pursuant to the Decrees, with respect to bonds with a maturity of five years and more, the withholding tax rate on interest is 0% Accordingly, under current Turkish tax law, withholding tax at the rate of 0% applies to interest on the Notes.