November 2004

30.11.2004
MTS’ Intranet Roaming Zone: Ulyanovsk Region

From November 30, 2004, the Ulyanovsk region will be integrated into MTS’ intranet roaming zone.

30.11.2004
MTS Announces the Launch of its Network in the Ulyanovsk Region

The Ulyanovsk Region is the 67th Russian region to receive MTS’ network coverage.

29.11.2004
MTS Acquires a Mobile Phone Operator in the Russian Far East

Moscow, Russian Federation — November 29, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the acquisition of a majority stake in Sibintertelecom, a GSM mobile phone operator in the Chita Oblast and Aginsk-Buryatsk Autonomous District in the Far Eastern part of Russia.

23.11.2004
Financial Results for the Third Quarter Ended September 30, 2004

Moscow, Russian Federation — November 23, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its third quarter 20041 financial and operating results, demonstrating significant revenues growth and further margin expansion.

19.11.2004
MTS Buys Mobile Company in the Russian Far East

Moscow, Russian Federation — November 19, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has won a government privatization tender for GSM mobile phone operator, Gorizont RT, working in the Republic of Sakha (Yakutia) in the Far East of Russia.

16.11.2004
MTS Announces the Launch of its Network in Buryatia

The Republic of Buryatia is the 64th Russian region to receive MTS’ network coverage.

12.11.2004
09.11.2004
Long Distance Calls Charged as Mobile Calls!

MTS offers its users the opportunity to call ALL MTS and JEANS users in any other Russian region under their home network rates1. In addition, incoming calls from ALL MTS users are FREE!

09.11.2004
Mobile TeleSystems’ General Meeting Results

Moscow, Russian Federation, 9 November 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the decisions made today at the Extraordinary General Meeting of the Company’s shareholders.

03.11.2004
MTS Announces Subscriber Growth Numbers for October 2004

Moscow, Russian Federation — November 3, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 27.79 million users on October 31, 2004.

02.11.2004
MTS’ Intranet Roaming Zone: Astrakhan Region

From November 2, 2004 the Astrakhan region will be integrated into MTS’ intranet roaming zone.

02.11.2004
MTS Announces the Launch of its Network in the Astrakhan Region

MTS’ services will be available in the Astrakhan region from November 2, 2004.

02.11.2004
Your Mobile Personal Translator!

MTS introduces its new unique service: Russian-English, English-Russian translator on your mobile phone!

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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