2005

30.08.2005
Financial Results for the Second Quarter Ended June 30, 2005

Moscow, Russian Federation — August 30, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces excellent financial and operating results for the second quarter of 20051 featuring strong financial performance, robust subscriber growth and ARPU increase.

01.06.2005
Financial Results for the First Quarter Ended March 31, 2005

Moscow, Russian Federation – June 1, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its first quarter 20051 financial and operating results.

22.03.2005
Financial Results for the Fourth Quarter and Full-Year Ended December 31, 2004

Moscow, Russian Federation — March 22, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its fourth quarter and full-year 20041 financial and operating results.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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