April 2008

21.04.2008
MTS Ranked in World’s 100 Most Powerful Brands

First Russian Company to Achieve Global Brand Recognition

Moscow, Russian Federation, April 21, 2008 – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announced that it has been named as one of the BRANDZ™ Top 100 Most Powerful Brands, a ranking published by the Financial Times and Millward Brown, a leading global market research and consulting firm. MTS is the first and only Russian company to join the ranks of the most powerful brands in the world, which stands as a recognition of its leadership across the CIS and increasing global relevance.

17.04.2008
MTS announces subscriber growth numbers for March 2008

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 84.94 million users on March 31, 2008.

16.04.2008
Mobile TeleSystems announces financial results for the fourth quarter and full year ended December 31, 2007

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), today announced its consolidated US GAAP financial results for the three months (unaudited) and full year ended December 31, 2007.

16.04.2008
Decisions of the Board of Directors

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announced the decisions reached at the Board of Directors meeting held on April 14, 2008.

10.04.2008
Fourth quarter and full year 2007 financial results announcement and conference call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Fourth Quarter and Full Year 2007 Financial and Operating Results on Wednesday, April 16, 2008.

09.04.2008
CEO of MTS Joins the Board of the GSM Association

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its CEO Leonid Melamed joins the Board of the GSM Association (GSMA), the global trade association for the mobile industry.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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