August 2009

19.08.2009
MTS Announces Subscriber Growth Numbers for July 2009

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 95.65 million users on July 31, 2009.

18.08.2009
MTS Announces the Date of the Extraordinary General Meeting of Shareholders

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the date of the Extraordinary General Meeting of shareholders (EGM).

11.08.2009
Mobile TeleSystems Announces Financial Results for the Second Quarter Ended June 30, 2009

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), today announces its consolidated US GAAP financial results for the three months ended June 30, 2009.

05.08.2009
MTS to Acquire Controlling Stake of COMSTAR-UTS

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that the boards of directors of MTS and Sistema JSFC (“Sistema” – LSE: SSA), the largest public diversified financial corporation in Russia and the CIS, have approved the acquisition by an MTS subsidiary of a 50.91% stake in COMSTAR – United TeleSystems (“COMSTAR-UTS” – LSE: CMST), a leading supplier of integrated telecommunication solutions in Russia and the CIS, from Sistema.

05.08.2009
Second Quarter 2009 Financial Results Announcement and Conference Call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Second Quarter 2009 Financial and Operating Results on Tuesday, August 11, 2009.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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