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.

MTS Enters Kamchatka

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

MTS’ Intranet Roaming Zone: the Republic of Chuvashia

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

MTS Announces the Launch of its Network in the Magadan Region

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

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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