May 2011

26.05.2011
Mobile TeleSystems Announces Financial Results for the First Quarter Ended March 31, 2011

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), the leading telecommunications provider in Russia and the CIS, today announces its unaudited US GAAP financial results for the three months ended March 31, 2011.

19.05.2011
MTS Repurchases Series 04 Ruble Bond

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or "the Company" – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the repurchase of the series 04 ruble-denominated bond in the amount of approximately RUB 1.103 billion.

19.05.2011
First Quarter 2011 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 2011 Financial and Operating Results on Thursday, May 26, 2011.

11.05.2011
MTS Sets New Coupon Rate on Series 04 Ruble Bond

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or "the Company" – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces a change in the coupon rate of the series 04 ruble-denominated bond ("the bond") from an annual rate of 16.75% to 7.6%.

10.05.2011
MTS’ Brand is Again Recognized as the Most Valuable Brand in Russia

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or “the Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces it has been named as one of the BRANDZ™ Top 100 Most Powerful Brands, a ranking published by the Financial Times and Millward Brown Optimor, a leading global market research and consulting firm. In 2011, MTS’s brand is yet again ranked as the most valuable Russian brand. It stands at the 80th position with a brand value of $10.9 billion.

05.05.2011
Commencement of Trading on MICEX of the Additional Share Issue

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or “the Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that following a decision by the Directorate of the Moscow Interbank Currency Exchange (“MICEX” or “the exchange”) on April 28, 2011 the Company’s additional share issue in the amount of 73,087,424 ordinary shares today commenced trading on the exchange as part of the “A1” quotation list.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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