2005

30.12.2005
MTS Consolidates Ownership in its Subsidiary in Central Russia

Moscow, Russian Federation – December 30, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired the remaining 46.1% share of ReCom, a mobile phone operator in the Central part of Russia.

21.12.2005
MTS Increases Ownership in its Siberian Subsidiary to 100%

Moscow, Russian Federation – December 21, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired an additional 6.47% share of Sibintertelecom, a mobile phone operator in the Siberian part of Russia.

16.12.2005
MTS Increases Ownership in its Subsidiary in Southern Russia to 100%

Moscow, Russian Federation – December 16, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired the remaining 47.5% of Telesot-Alania, a GSM mobile phone operator in the Republic of North Ossetia.

12.12.2005
MTS Acquires Bitel and Enters the Kyrgyz Market

Moscow, Russia – December 12, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the acquisition of a 51% stake in Bitel, the leading mobile phone operator in the Kyrgyz Republic.

10.12.2005
MTS’ New Sales and Customer Care Office in Sheremetievo-2

MTS’ services are now available at the legendary airport in Moscow !

09.12.2005
MTS Announces Subscriber Growth Numbers for November 2005

Moscow, Russian Federation – December 9, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 54.11 million users on November 30, 2005.

05.12.2005
New Charges for MTS’ Voice Services

From December 15, 2005, MTS’ rates for voice services on the following quick dial numbers will change: 0646, 0647, 0837, 0871 and 0935.

01.12.2005
December Only: Activate MTS’ “Open” Service and Receive a 30% Discount until January 31, 2006!

The New Year season is a time to receive gifts and congratulations — MTS invites you to activate the “Open” service during December to receive a 30% discount, free incoming calls and 30 inclusive minutes for outgoing calls!

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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