2004

23.11.2004
Financial Results for the Third Quarter Ended September 30, 2004

Moscow, Russian Federation — November 23, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its third quarter 20041 financial and operating results, demonstrating significant revenues growth and further margin expansion.

31.08.2004
Financial Results for the Second Quarter Ended June 30, 2004

Moscow, Russian Federation — August 31, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces excellent financial and operating results demonstrated by increased revenues, net income and free cash-flow for the second quarter of 20041.

16.06.2004
Financial Results for the First Quarter Ended March 31, 2004

Moscow, Russian Federation — June 16, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and Ukraine, today announces its financial and operating results for the first quarter ended March 31, 20041.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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