April 2015

24.04.2015
Ad-Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications operator in Russia and the CIS, announces that Moody's Investors Service has confirmed the Ba1 corporate family rating and Ba1-PD probability of default rating of MTS. The outlook on MTS`s corporate family rating is negative, in line with the negative outlook for the Russia`s sovereign rating. With this rating action Moody`s has concluded the review for downgrade initiated on February 25, 2015. Moody’s has also confirmed the Ba1 senior unsecured ratings assigned to the outstanding notes issued by MTS International Funding Limited.

22.04.2015
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications operator in Russia and the CIS, announces that it has filed its annual report on Form 20-F for the fiscal year ended December 31, 2014 with the United States Securities and Exchange Commission.

15.04.2015
MTS Announces Decisions of its 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 meeting of its Board of Directors (“BoD” or “the Board”) held on April 14, 2015.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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