March 2008

25.03.2008
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the acquisition of Bastion LLC.

19.03.2008
MTS announces subscriber growth numbers for February 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 83.88 million users on February 29, 2008.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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