October 2007

16.10.2007
MTS announces subscriber growth numbers for September 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 77.97 million users on September 30, 2007.

09.10.2007
Moody’s upgrades Mobile TeleSystems to Ba2; positive outlook

Moscow, Russian Federation — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that Moody&$146;s Investors Service has upgraded the corporate family and existing bond ratings of MTS to Ba2 from Ba3. The outlook on the ratings is positive.

08.10.2007
MTS allocated frequencies to offer 3G products and services in Armenia

Moscow, Russian Federation — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces allocation of frequencies to offer 3G (UMTS) services in Armenia.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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