December 2004

24.12.2004
MTS Acquires a Majority Stake in a Mobile Phone Operator in Southern Russia

Moscow, Russian Federation — December 24, 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 Telesot-Alania, a GSM mobile phone operator in the Republic of North Ossetia in the Southern part of Russia.

21.12.2004
MTS Enters Kamchatka

The Kamchatka region is the 74th Russian region to receive MTS’ network coverage.

17.12.2004
MTS Announces the Launch of its Network in the Magadan Region

The Magadan region is the 73th Russian region to receive MTS’ network coverage.

17.12.2004
MTS’ Intranet Roaming Zone: the Republic of Chuvashia

From December 16, 2004 the Republic of Chuvashia is integrated into MTS’ intranet roaming zone.

16.12.2004
MTS Announces the Launch of its Network in the Republic of Chuvashia

The Republic of Chuvashia is the 72-nd Russian region to receive MTS’ network coverage.

16.12.2004
JEANS-Minute: Reduced Fees!

Activation fee reduced!

15.12.2004
MTS Receives a $150 Million Loan from the EBRD

Moscow, Russian Federation — December 15, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has received a $150 million loan from the European Bank for Reconstruction and Development (EBRD).

15.12.2004
MTS Announces an ADR Ratio Change

Moscow, Russian Federation — December 15, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it will be changing its current American Depositary Receipt (ADR) ratio effective January 3, 2005, the first trading day in the new year.

14.12.2004
2005 Bonus Seconds for New Super JEANS and JEANS 0.07 Users

As a New Year bonus, all new JEANS users in the Moscow region will be offered 2005 free seconds!

14.12.2004
MTS Completes Acquisition of Gorizont RT

Moscow, Russian Federation — December 14, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has completed the previously announced transaction to acquire Gorizont RT, a GSM mobile phone operator in the Republic of Sakha (Yakutia) in the Far East of Russia.

09.12.2004
MTS Announces the Launch of its Network in the Kemerovo Region

The Kemerovo region is the 68th Russian region to receive MTS’ network coverage.

06.12.2004
MTS Announces Subscriber Growth Numbers for November 2004

Moscow, Russian Federation — December 6, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 29.50 million users on November 30, 2004.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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