April 2011

27.04.2011
Decisions of the MTS Board of Directors

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or “the Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the decisions reached at the Company’s Board of Directors (“BoD” or “the Board”) meeting held on April 27, 2011.

26.04.2011
MTS Group Acquires Leading Alternative Operator in Kurgan

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that the MTS Group acquired 100% in each of the five companies operating under the Infocentr brand (“Infocentr”) in Kurgan, the administrative center of the Kurgan region of the Urals Federal District, from a group of private investors. Following the acquisition, MTS will now be able to provide broadband internet and cable television services in all regions of the Urals Federal District.

22.04.2011
Registration of Share Issuance Report

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or “the Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the registration of the Company’s share issuance report by the Federal Financial Markets Service of Russia (“FFMS”).

05.04.2011
Mobile TeleSystems Announces Financial Results for the Fourth Quarter and Full Year Ended December 31, 2010

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 December 31, 2010.

04.04.2011
Notice of Completion of Comstar Merger

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or “the Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that on April 1, 2011 the record of termination of COMSTAR – United TeleSystems JSC (“Comstar” – LSE: CMST) as a separate legal entity was entered into the Unified State Register thereby completing the merger of Comstar into MTS. In accordance with the terms of the merger, qualifying holders of Comstar ordinary shares received MTS ordinary shares at an exchange ratio of 0.825 MTS ordinary shares for each Comstar ordinary share. A total of 98,853,996 Comstar shares were converted into existing MTS treasury shares as well as newly issued MTS shares. As a result, MTS’ charter capital increased by 73,087,006 ordinary shares to a total of 2,066,413,144 ordinary shares. The state registration number of the newly issued MTS shares is 1-01-04715-А-002D.

04.04.2011
MTS Group Acquires Alternative Operator in Altai Krai

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that MTS Group has acquired 100% in Inteleca Group of companies (“Inteleca”), an alternative operator in the cities of Barnaul and Biysk in Altai Krai of the Siberian Federal District, from a group of private investors. The acquisition allows MTS to strengthen its position in the broadband internet and cable TV markets in the region.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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