September 2011

27.09.2011
MTS Announces New Appointments

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces appointment of Ivan Zolochevsky to the position of General Director of Business Unit “MTS Ukraine”, who previously served as Director of the North-West Macro-Region of MTS in Russia.

15.09.2011
MTS Board Approves Acquisition of Sistema Inventure

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that MTS Board of Directors has approved the acquisition by MTS subsidiaries of a 100% stake in Sistema Inventure which directly owns 29% of the voting stock of Moscow City Telephone Network (“MGTS”).

06.09.2011
Mobile TeleSystems Announces Financial Results for the Second Quarter Ended June 30, 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 June 30, 2011.

06.09.2011
Mobile TeleSystems Announces Financial Results for the Second Quarter Ended June 30, 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 June 30, 2011.

06.09.2011
MTS to Increase Ownership of MGTS to 94.1%

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that MTS has presented an indicative offer to Sistema JSFC (“Sistema” – LSE: SSA), the largest public diversified financial corporation in Russia and the CIS, for the acquisition of Sistema Inventure CJSC (“Sistema Inventure”), which directly owns 29% of the voting stock of Moscow City Telephone Network (“MGTS”). The transaction would increase MTS’s ownership of MGTS to 94.1%.

05.09.2011
MTS Appoints Vice President for Marketing

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces appointment of Vasyl Latsanych to the position of Vice President, Marketing.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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