June 2008

27.06.2008
MTS announces the results of the Annual General Meeting of shareholders

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the decisions made at the Annual General Meeting (AGM) of the Company’s shareholders on June 27, 2008.

25.06.2008
MTS announces successful 10 billion rouble bond placement on MICEX

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announced the terms for the placement of its first rouble bond. The 10 billion rouble bond will be due in 2018, with the notes carrying a coupon of 8.70%.

18.06.2008
MTS announces subscriber growth numbers for May 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 86.30 million users on May 31, 2008.

11.06.2008
Ad Hoc Notice

2007 annual report filing on form 20-F

11.06.2008
MTS announces the date of the rouble bond placement

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announced that the placement of its debut rouble bond will start on June 24, 2008.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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