June 2010

28.06.2010
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, has filed its annual report on form 20-F for the fiscal year 2009 with the United States Securities and Exchange Commission.

28.06.2010
MTS Increases Stake in SWEET-COM to 100%

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that it has increased its ownership in SWEET-COM LLC to 100%.

28.06.2010
MTS Wins 2010 Meffys Mobile Entertainment Award for Omlet.ru Content Portal

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that it has won the 2010 Meffys Mobile Entertainment Award in the “Cross-Platform Technology” category for Omlet.ru content portal.

25.06.2010
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (the “Company” or “MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, corrects the statement made in the press release titled “MTS Announces the Results of the Annual General Meeting of Shareholders” issued on June 24, 2010. The following statement was incorrect in the release: “Independent directors Mr. Charles Dunstone, Mr. Stanley Miller and Mr. Paul Ostling were elected to the Company’s Audit Committee with Mr. Ostling elected as the Chairman of the Audit Committee.” The correct statement should read: “Independent directors Mr. Stanley Miller and Mr. Paul Ostling were elected to the Company’s Audit Committee with Mr. Ostling elected as the Chairman of the Audit Committee.”

25.06.2010
MTS Announces the Date of the Extraordinary General Meeting of Shareholders

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), the leading telecommunications provider in Russia and the CIS, today announces the date of the Extraordinary General Meeting of shareholders (EGM).

25.06.2010
Board of Directors of MTS Approves Agreements Signed by Comstar-UTS with Rostelecom

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), the leading telecommunications provider in Russia and the CIS, today announces that its Board of Directors approved the agreements signed in May by “COMSTAR – United TeleSystems” JSC (“Comstar” - LSE: CMST), a majority-owned subsidiary of MTS, MGTS Finance S.A., a company controlled by Comstar, and OAO Rostelecom (“Rostelecom” - RTS and MICEX: RTKM, RTKMP; OTCQX: ROSYY) involving the sale of the 25%+1 share1 of OAO Svyazinvest to OAO Rostelecom for RUB 26 billion.

24.06.2010
MTS Repurchases Series 03 Ruble-Denominated Bond

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the repurchase of the series 03 ruble-denominated bond in the amount of 179.5 million rubles.

24.06.2010
MTS Announces the Results of the Annual General Meeting of Shareholders

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the decisions made at the Annual General Meeting (AGM) of the Company’s shareholders on June 24, 2010.

23.06.2010
MTS Issues Eurobond

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the issuance of its USD-denominated Loan Participation Notes in the amount of $750 mln with an annual interest rate of 8.625% and a maturity in June 2020. The proceeds will be used to refinance certain existing debt obligations.

23.06.2010
MTS Proposes Move to the “A1” Listing on MICEX

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces its plans to move the Company’s ordinary shares traded on the Moscow Interbank Currency Exchange (MICEX) under ticker symbol “MTSI” from the current quotation list “B” to quotation list “A1”. The new listing will stimulate additional demand and increase liquidity by expanding the investor pool as Russian non-government pension funds, management companies accredited by the Russian State Pension Fund, insurance companies and other investors will now be able to trade in MTS' ordinary shares.

23.06.2010
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (the “Company” or “MTS” – NYSE: MBT) notes the press reports of June 23, 2010. MTS acknowledges that its Board of Directors (BoD) is engaged in discussions about a potential consolidation by MTS of the outstanding minority shareholdings in Comstar-UTS using a potential combination of equity and cash. Certain terms outlined in the press reports are not reflective of the terms being discussed. A decision could be taken at the next meeting of the Board of Directors, which is scheduled for Friday, June 25, 2010.

21.06.2010
21.06.2010
MTS to Launch “360 from MTS” – an Innovative Suite of Mobile Internet Services

Moscow, Russian Federation – Vodafone, the world's leading international mobile communications group and Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, have announced at the Saint Petersburg International Economic Forum 2010 the planned launch of 360 from MTS – an innovative suite of Internet services that integrate a customer’s social networks, email and mobile content in an intuitive and friendly user experience. 360 from MTS is based on the Vodafone 360 service and has been adapted for the Russian market.

21.06.2010
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (the “Company” or “MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, notes the Interfax report on 18 June of comments made by Vladimir Evtushenkov, the Chairman of Sistema, MTS’ majority shareholder, regarding the potential further consolidation of Comstar by MTS. The Board of Directors of MTS reaffirms its previously stated position that any further consolidation or integration of Comstar by MTS will be decided upon by the MTS Board of Directors and that it is considering all options in this respect.

08.06.2010
First Quarter 2010 Financial Results

Moscow, Russian Federation — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the leading telecommunications provider in Russia and the CIS, today announces its unaudited US GAAP financial results for the three months ended March 31, 2010.

04.06.2010
MTS Appoints Alexey Kornya as the New Vice President and Chief Financial Officer

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the appointment of Mr. Alexey Kornya as Vice President and Chief Financial Officer (CFO).

03.06.2010
MTS Further Optimizes its Debt Portfolio

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that it has repaid loans in the amount of EUR 413 million to a consortium of banks led by the European Bank for Reconstruction and Development (EBRD) and has successfully renegotiated downwards the interest rate on a credit line with the Bank of Moscow.

02.06.2010
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (the “Company” or “MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that “COMSTAR – United TeleSystems” JSC (“Comstar” - LSE: CMST), a majority-owned subsidiary of MTS, has released its first quarter 2010 financial and operating results earlier today.

01.06.2010
First Quarter 2010 Financial Results Announcement and Conference Call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s First Quarter 2010 Financial and Operating Results on Tuesday, June 8, 2010.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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