January 2005

26.01.2005
Information for MTS’ ADR and GDR Holders

Moscow, Russian Federation — January 26, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that the Company’s Board of Directors has instructed management to authorise the depositary bank for MTS’ ADR program, JP Morgan, to increase the Company’s ADR program from the current 23% to 39% of the Company’s shares.

17.01.2005
Mobile TeleSystems Announces Plans to Issue Eurobonds

Moscow, Russian Federation — January 17, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT) today announces its plans to raise financing through the placement of senior unsecured USD-denominated eurobonds issued under Rule 144A/Regulation S.

12.01.2005
MTS Announces Subscriber Growth Numbers for December 2004

Moscow, Russian Federation — January 12, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the number of subscribers in December 2004.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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