August 2011

29.08.2011
Ad Hoc Notice

Moscow, Russian Federation — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces completion of the dividend payment for the full year 2010.

23.08.2011
MTS Enters Fixed Broadband and Cable TV Markets in Tula

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that the MTS Group acquired a 100% stake in each of the four companies operating under the Altair brand (“Altair”), the largest cable TV provider and leading broadband provider in Tula, the administrative center of the Tula region of the Central Federal District, from a group of private investors. The acquisition will enable MTS to become the leading provider of broadband internet and cable television services in Tula and will strengthen Company’s fixed-line business in the Central Federal District.

10.08.2011
Merger of MTS’ Additional and Main Share Issues

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that the Company’s ordinary shares are expected to commence trading on the Moscow Interbank Currency Exchange (“MICEX”) under a single ticker symbol MTSI beginning from August 11, 2011 following the merger of the additional share issue with MTS’ main issue. Earlier, the Federal Financial Markets Service cancelled the individual number (code) of the additional share issue after the expiration of the legally mandated three-month period1.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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