June 2007

29.06.2007
MTS’ annual general meeting results

MOSCOW, RUSSIAN FEDERATION – JUNE 29, 2007 – MOBILE TELESYSTEMS OJSC (“MTS” - NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THE DECISIONS MADE AT THE ANNUAL GENERAL MEETING (AGM) OF THE COMPANY’S SHAREHOLDERS ON JUNE 29, 2007.

29.06.2007
MTS acquires remaining stake in Uzdunrobita

MOSCOW, RUSSIAN FEDERATION – JUNE 28, 2007 – MOBILE TELESYSTEMS OJSC (“MTS” - NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT IT HAS ACQUIRED THE REMAINING 26% STAKE IN UZDUNROBITA.

28.06.2007
MTS announces employee motivation and retention program

MOSCOW, RUSSIAN FEDERATION – JUNE 27, 2007 – MOBILE TELESYSTEMS OJSC (“MTS” - NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT THE COMPANY’S BOARD OF DIRECTORS HAS APPROVED AN EMPLOYEE REMUNERATION PROGRAM.

25.06.2007
2006 Annual report filing on form 20-f

MOSCOW, RUSSIAN FEDERATION – JUNE 25, 2007
Mobile TeleSystems has filed its annual report on form 20-F for the fiscal year 2006 with the United States Securities and Exchange Commission.

15.06.2007
MTS Announces Subscriber Growth Numbers for May 2007

MOSCOW, RUSSIAN FEDERATION — JUNE 15, 2007 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT ITS CONSOLIDATED SUBSCRIBER BASE REACHED 74.64 MILLION USERS ON MAY 31, 2007.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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