June 2011

29.06.2011
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that the Company has acquired 100% stake in Investitsii LLC.

27.06.2011
MTS Announces the Results of the Annual General Meeting of Shareholders

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the decisions reached at the Company’s Annual General Meeting of Shareholders (the “AGM”) held on June 27, 2011.

17.06.2011
Ad Hoc Notice

Moscow, Russian Federation — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the leading telecommunications provider in Russia and the CIS, has today filed its annual report on Form 20-F for the fiscal year ended December 31, 2010 with the United States Securities and Exchange Commission.

15.06.2011
MTS’ Multimedia Cloud Service Omlet.ru Shortlisted for Coveted 2011 Meffys Award

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or "the Company" – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, today announced its pioneering multimedia cloud service, Omlet.ru, has been shortlisted for the coveted global 2011 Meffys Awards under the “Best Technology Innovation” category.

08.06.2011
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that the Moscow City Telephone Network JSC (“MGTS”), a majority-owned subsidiary of MTS, has increased its stake in Intellect Telecom OJSC (“Intellect Telecom”), a research and development subsidiary of JSFC Sistema (“Sistema” – LSE: SSA), from 39.01% to 49.95% following the completion of the registration of the additional shares issuance report with the Federal Financial Markets Service of the Russian Federation.

03.06.2011
MTS Wins Eurolawyer 2011 Award

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or "the Company" – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that MTS has been awarded at the 4th CIS-EU Legal Forum: Eurolawyer 2011 in the category CIS Legal Department of the Year: Best Work in Obtaining Financing on Capital Markets.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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