2007

20.11.2007
Financial results for the third quarter ended September 30, 2007

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

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.

31.05.2007
Financial Results for the First Quarter Ended March 31, 2007

MOSCOW, RUSSIAN FEDERATION — MAY 31, 2007 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES ITS FIRST QUARTER 20071 FINANCIAL AND OPERATING RESULTS.

30.05.2007
MTS Announces Change to 2006 Reported Financial Results

MOSCOW, RUSSIAN FEDERATION — MAY 30, 2007 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT IT WILL RECORD A CHARGE TO NON-OPERATING EXPENSES FOR THE YEAR ENDED DECEMBER 31, 2006 IN RELATION TO A $170 MILLION PUT OPTION HELD BY NOMIHOLD SECURITIES INC. («NOMIHOLD»).

21.03.2007
Financial Results for the Fourth Quarter and Full-Year Ended December 31, 2006

MOSCOW, RUSSIAN FEDERATION — MARCH 21, 2007 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES ITS FOURTH QUARTER AND FULL-YEAR 20061 FINANCIAL AND OPERATING RESULTS.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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