August 2006

31.08.2006
Official Statement on Bitel

MOSCOW, RUSSIAN FEDERATION — AUGUST 31, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ADVISES THAT COURT ACTION AGAINST THE AFFILIATED WITH MTS COMPANIES IN THE ISLE OF MAN WILL BE VIGOROUSLY DEFENDED.

29.08.2006
MTS’ ZachOt Offer for Students — only 3 cents/min!

Are you a student? This offer is specially for you!

29.08.2006
New Appointments as Part of the Structural Reorganization of MTS

MOSCOW, RUSSIAN FEDERATION — AUGUST 29, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES NEW APPOINTMENTS MADE AS PART OF THE COMPANY’S REORGANIZATION OF THE MANAGEMENT STRUCTURE.

29.08.2006
Invitation to MTS’ Second Quarter 2006 Financial Results Announcement and Conference Call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Second Quarter 2006 Financial and Operating Results on Tuesday, September 5, 2006.

21.08.2006
Change of MTS-Info Rates

From September 1, 2006 MTS-Info rates will change.

21.08.2006
MMS Exchange: MTS OJSC and BashSel CJSC

From August 21, 2006, MMS exchange will be available between MTS (the «Moscow», «Center», «Povolzhie South-East», «Povolzhie North-West» and «Ural» macro regions) and BashCel users.

18.08.2006
Uzdunrobita Option Amendment

MOSCOW, RUSSIAN FEDERATION — AUGUST 18, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES SIGNING AN AMENDMENT TO THE OUTSTANDING OPTION ON THE REMAINING 26% STAKE IN UZDUNROBITA.

18.08.2006
MTS’ Team Tariff Plans — Change of the Name

From September 1, 2006 the name of the «Team» tariff plan will change to «MTS. Team» and the name of the «Team’» tariff plan will change to «MTS. Team’».

18.08.2006
Renovation of MTS’ «Novoarbatsky» Salon-Shop

MTS’ salon-shop at 15, Novy Arbat will be closed for renovation from 22 o 27 August, 2006.

17.08.2006
Syndicated Loan a Success

MOSCOW, RUSSIAN FEDERATION — AUGUST 17, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, IS PLEASED TO ANNOUNCE THE SUCCESS OF ITS $1.33 BILLION SYNDICATED LOAN FACILITY.

15.08.2006
MTS: New Management Structure Approved

MOSCOW, RUSSIAN FEDERATION — AUGUST 15, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THE APPROVAL BY THE BOARD OF DIRECTORS (BOD) OF THE NEW MANAGEMENT STRUCTURE.

15.08.2006
MTS’ New Service — Real Friend

Bring communication to your nearest with MTS’ new service.

14.08.2006
MTS’ Live Sound — New Mobile Music Shop

MTS offers its users a new musical service at WAP portal, allowing them to download ring tones in the full mp3 track format and set them up to replace standard ring tones. Visitors of MTS’ Live Sound WAP shop will be offered special promotions and pleasant surprises.

14.08.2006
Internet will Become Cheaper

MTS’ unique offer for its corporate users – buy traffic wholesale.

11.08.2006
MTS Announces Subscriber Growth Numbers for July 2006

MOSCOW, RUSSIAN FEDERATION — AUGUST 11, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT ITS CONSOLIDATED SUBSCRIBER BASE REACHED 65.72 MILLION USERS ON JULY 30, 2006.

11.08.2006
Closing of MTS’ «Na&nbsp;Pyatnitskoi» <nobr>Salon-Shop</nobr>

MTS’ salon-shop at 49, Build. 3, Pyatnitskaya Ulitsa will be closed from August 31, 2006.

08.08.2006
MTS’ Salons-Shops: Opening Hours Will Be Longer

From August 1, 2006 most* MTS’ salons-shops in Moscow and the Moscow region will open to 21:00.

07.08.2006
MTS’ Free Content Day

Every Tuesday MTS will offer its users the Free Content Day!

01.08.2006
MTS’ Promotion: i-mode Phone with a 50% Discount

From July 5 to August 31, 2006, MTS offers its users to buy an i-mode phone with a 50% discount

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
App for iPad