December 2007

18.12.2007
MTS announces subscriber growth numbers for November 2007

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 80.21 million users on November 30, 2007.

18.12.2007
MTS Completes NetCracker Deployment in Moscow and Central Russia Regions

Moscow, Russia / Waltham MA, USA — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, together with NetCracker Technology, announced today that they have completed the production deployment of the NetCracker solution in Moscow and Central Russia. The solution, based on the NetCracker product suite, will optimize infrastructure and inventory management processes and establish a central information source for the planning, design, and management of the MTS network.

18.12.2007
MTS acquires Bashcell

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired 100% of Bashcell, a mobile phone operator in Russia’s Volga region.

12.12.2007
MTS is a leader of National Purchases Transparency Rating 2007

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, receives the highest grade in the National Purchases Transparency Rating, an annual rating organized by the National Association of Electronic Trade Participants and supported by the Federal Antitrust Agency and State Duma Counter Corruption Commission.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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