June 2004

25.06.2004
Mobile Telesystems’ Annual General Meeting Decisions

Moscow, Russian Federation, 25 June 2004 — Mobile TeleSystems (“MTS” — NYSE: MBT) yesterday held an Annual General Meeting of the Сompany’s shareholders.

16.06.2004
Financial Results for the First Quarter Ended March 31, 2004

Moscow, Russian Federation — June 16, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and Ukraine, today announces its financial and operating results for the first quarter ended March 31, 20041.

10.06.2004
MTS Announcement Regarding the Legal Proceedings

Moscow, Russian Federation — June 10, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and Ukraine, reports on the legal action taken against the Company in Ukraine.

03.06.2004
MTS Announces Subscriber Growth Numbers for May 2004

Moscow, Russian Federation — June 3, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and Ukraine, announces that its consolidated subscriber base reached 21.29 million users on May 31, 2004.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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