May 2008

29.05.2008
Conference call invitation

The management of Mobile TeleSystems (MTS) will be holding a conference call on Thursday, May 29, 2008, to discuss strategic and operational developments in the Company.

29.05.2008
MTS announces the appointment of the new chief executive officer

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announced the appointment of Mr. Mikhail Shamolin as President and Chief Executive Officer (CEO) of Mobile TeleSystems OJSC (MTS).

28.05.2008
MTS launches 3G in Russia

First pan-regional 3G network in Russia to initially cover four cities

20.05.2008
Financial results for the first quarter ended March 31, 2008

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

20.05.2008
MTS announces recommended amount of dividends for FY 2007

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the recommended amount of dividends for the full year 2007.

16.05.2008
MTS announces subscriber growth numbers for April 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 85.68 million users on April 30, 2008.

13.05.2008
First 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 First Quarter 2008 Financial and Operating Results on Tuesday, May 20, 2008.

08.05.2008
MTS amends employee remuneration program

Moscow, Russian Federation, May 7, 2008 – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announced the expansion of its employee remuneration program.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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