May 2009

26.05.2009
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, has filed its annual report on form 20-F for the fiscal year 2008 with the United States Securities and Exchange Commission.

26.05.2009
MTS Launches 3G in Moscow

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the launch of the first phase of its 3G network in Moscow. The first indoor network was launched in Expocentre, one of the largest exhibition centers in Eastern Europe.

22.05.2009
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, affirms statements made by Mikhail Shamolin, President and CEO of the Company.

22.05.2009
Mobile TeleSystems Announces Financial Results for the First Quarter Ended March 31, 2009

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), today announces its consolidated US GAAP financial results for the three months ended March 31, 2009.

22.05.2009
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has filed an application to the Federal Anti-Monopoly Service (FAS) to receive approval for the acquisition of up to 100% of Comstar UTS.

21.05.2009
MTS Announces Dividend Recommendation for FY2008 and Nominees to the Board

Moscow, Russian Federation — Mobile TeleSystems OJSC (‚MTS‘ — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the decisions reached at the Board of Directors meeting held on May 21, 2009, on the dividend amount recommendation and the nominees for election to the Company’s Board.

19.05.2009
MTS Announces Successful Ruble Bond Placement

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has successfully placed its fourth ruble bond. The 15 billion ruble bond has a maturity in 2014.

18.05.2009
MTS Signs a Syndicated Loan Facility Agreement

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has signed a facility agreement to refinance a portion of its $1.33 billion syndicated loan facility.

18.05.2009
MTS Announces Subscriber Growth Numbers for April 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 93.03 million users on April 30, 2009.

14.05.2009
First 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 First Quarter 2009 Financial and Operating Results on Friday, May 22, 2009.

12.05.2009
MTS Announces Ruble Bond Placement

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it will place a 15 billion ruble bond.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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