August 2008

28.08.2008
Standard and Poor’s upgrades Mobile TeleSystems to BB; positive outlook

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that Standard & Poor's Ratings Services has upgraded the long-term corporate credit rating of MTS to “BB” from “BB-“. The outlook on the ratings remains positive.

28.08.2008
MTS Board of Directors affirms share repurchase

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announced that its Board of Directors have affirmed share repurchase related to the merger of Mobile Communication Systems and BashCELL CJSC.

19.08.2008
MTS announces subscriber growth numbers for July 2008

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 87.26 million users on July 31, 2008.

12.08.2008
Financial results for the second quarter ended June 30, 2008

Moscow, Russian Federation — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces its second quarter1 2008 financial and operating results.

12.08.2008
MTS Appoints New Head of MTS Russia

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the appointment of Mr. Aleksander Popovskiy as the Head of MTS Russia.

05.08.2008
Second quarter 2008 financial results announcement and conference call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Second Quarter 2008 Financial and Operating Results on Tuesday, August 12, 2008.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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