September 2006

29.09.2006
MTS Receives Decision of the Tax Review for the Years 2003 and 2004

MOSCOW, RUSSIAN FEDERATION — SEPTEMBER 29, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT IT HAS RECEIVED ON SEPTEMBER 28, 2006, A DECISION OF THE TAX INSPECTION FOR THE YEARS 2003 AND 2004. THE COMPANY DOES NOT AGREE WITH THE FINDINGS.

22.09.2006
MTS’ Weekends and Night calls services extension!

MTS’ Weekends service will be prolonged until April1, 2007 and MTS’ Night Calls service will be prolonged until March 30, 2007.

12.09.2006
MTS Announces Subscriber Growth Numbers for August 2006

MOSCOW, RUSSIAN FEDERATION — SEPTEMBER 12, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT ITS CONSOLIDATED SUBSCRIBER BASE REACHED 66.66 MILLION USERS ON AUGUST 31, 2006.

06.09.2006
Announcement of the Date of the Extraordinary General Meeting of Shareholders

MOSCOW, RUSSIAN FEDERATION — SEPTEMBER 06, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THE DATE OF THE EXTRAORDINARY GENERAL MEETING OF SHAREHOLDERS (EGM).

05.09.2006
Financial Results for the Second Quarter Ended June 30, 2006

MOSCOW, RUSSIAN FEDERATION — SEPTEMBER 5, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, TODAY ANNOUNCES ITS SECOND QUARTER 2006 FINANCIAL AND OPERATING RESULTS.

05.09.2006
MTS Announces Share Repurchase Program

MOSCOW, RUSSIAN FEDERATION — SEPTEMBER 05, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT THE BOARD OF DIRECTORS HAS APPROVED A SHARE REPURCHASE PROGRAM.

01.09.2006
Two New Subsidiaries Incorporated

MOSCOW, RUSSIAN FEDERATION — SEPTEMBER 1, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THE INCORPORATION OF TWO 100%-OWNED MTS SUBSIDIARIES IN BERMUDA AND IN THE NETHERLANDS.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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