April 2012

23.04.2012
Ad Hoc Notice

Moscow, Russian Federation — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the leading telecommunications provider in Russia and the CIS, has today filed its annual report on Form 20-F for the fiscal year ended December 31, 2011 with the United States Securities and Exchange Commission.

13.04.2012
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 12, 2012.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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