September 2004

06.09.2004
MTS Announces Subscriber Growth Numbers for August 2004

Moscow, Russian Federation — September 6, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 25.54 million users on August 31, 2004.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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