March 2007

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.

21.03.2007
MTS Announces the Appointment of a New Chief Technology Officer

MOSCOW, RUSSIAN FEDERATION — MARCH 21, 2007 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THE APPOINTMENT OF MR. MARCEL STOCKLI AS THE NEW CHIEF TECHNOLOGY OFFICER (CTO).

14.03.2007
MTS Announces Subscriber Growth Numbers for February 2007

MOSCOW, RUSSIAN FEDERATION — MARCH 14, 2007 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT ITS CONSOLIDATED SUBSCRIBER BASE REACHED 73.79 MILLION USERS ON FEBRUARY 28, 2007.

14.03.2007
Fourth Quarter and Full Year 2006 Financial Results Announcement and Conference Call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Fourth Quarter and Full Year 2006 Financial and Operating Results on Wednesday, March 21, 2007.

06.03.2007
MTS Writes Off Costs Relating to the Acquisition of Bitel

MOSCOW, RUSSIAN FEDERATION — MARCH 6, 2007 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES ITS DECISION TO WRITE OFF COSTS ASSOCIATED WITH THE ACQUISITION OF A 51% STAKE IN TARINO LIMITED, INDIRECT OWNER OF BITEL LLP (BITEL), A KYRGYZ GSM MOBILE PHONE OPERATOR, AT THE END OF 2005 IN THE AMOUNT OF $150 MILLION.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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