April 2009

28.04.2009
MTS Ranked in the World’s 100 Most Powerful Brands with a Brand Value of $9.2 billion

Moscow, Russian Federation — 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. For the second year in a row, MTS joins the ranks of the most powerful brands in the world with a value of $9.2 billion at the 71st position. As in 2008, MTS is the most valuable Russian brand in the ranking and one of the 10 most valuable telecoms brands in the world.

20.04.2009
MTS Launches 3G in Armenia

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the commercial launch of its 3G network in Armenia.

16.04.2009
MTS Announces Subscriber Growth Numbers for March 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 92.19 million users on March 31, 2009.

16.04.2009
Decisions of MTS’ Board of Directors (Record Date)

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 (BoD) meeting held on April 15, 2009.

14.04.2009
MTS Appoints New Chief Technology Officer

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the appointment of Mr. Andrey Ushatskiy as the new Chief Technology Officer and Vice President, Technology.

01.04.2009
MTS Acquires Eldorado Mobile Retail Chain in Russia

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired a 100% stake in Eldorado Centr LLC and Eldorado Communications Store LLC from Tenteco Limited (Cyprus) and Kilcherex Holdings Limited (Cyprus).

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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