September 2007

18.09.2007
MTS announces subscriber growth numbers for August 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 76.06 million users on August 31, 2007.

14.09.2007
MTS enters Armenia

Moscow, Russian Federation — Erevan, Armenia — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the acquisition of a 80% stake in International Cell Holding Ltd, 100% indirect owner of K-Telecom CJSC, Armenia’s largest mobile phone operator, as well as signing of a call and put option agreement for the remaining 20% stake to be exercised no earlier than July 2010.

04.09.2007
Financial results for the second quarter ended June 30, 2007

Moscow, Russian Federation — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces its second quarter1 2007 financial and operating results.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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