June 2006

30.06.2006
GPRS-Internet: MTS’ Offer for Corporate Users

Save money using MTS’ new GPRS-Internet package!

30.06.2006
Cancellation of MTS’ Federal Number Redialing Service

MTS’ Federal Numbers Redialing (Alternative Redialing) service is to be canceled.

29.06.2006
New MTS Service: MTS Numbers

MTS offers its users the new «MTS Numbers» service available to «First» users.

29.06.2006
New MTS Salon-Shop «V Electrostali»

MTS is pleased to announce the opening of its new salon-shop «V Electrostali».

28.06.2006
MTS’ Annual General Meeting Decisions

MOSCOW, RUSSIAN FEDERATION — JUNE 28, 2006 — 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 23, 2006.

23.06.2006
MTS’ Unlimited Weekends Offer

From July 3, 2006, MTS’ Unlimited Weekends and Unlimited Weekends on the First Tariff Plan will be united to form the Weekends service (same parameters provided).

23.06.2006
New MTS Website Section: Purchases

Attention Potential Partners!

22.06.2006
Notice about Procedures for Inquiring Offers

MTS announces the launch of its “Procedures for Inquiring Offers”, in which advertising agencies and producers of advertising materials are welcome to submit offers to participate in the development of MTS’ souvenir holiday catalogue for the New Year–First Quarter 2007 period.

20.06.2006
From July 1, 2006: Free Incoming Calls For All MTS Users

Information for MTS (and its subsidiaries)* users.

20.06.2006
MTS’ «Annual Contract» Changes

Information for MTS (and its subsidiaries)* users participating in the «Annual Contract: 50% Discount on Incoming or Outgoing Local and Mobile Calls» marketing campaign.

15.06.2006
Leonid Melamed was elected as MTS’ President and CEO

On June 14, 2006, the Extraordinary General Meeting of Shareholders (EGM) terminated the powers of the current President and CEO, Mr. Vasilly Sidorov, and elected Mr. Leonid Melamed as the Company’s new President and CEO. Mr. Melamed has been the acting President and CEO of MTS since April 14, 2006.

15.06.2006
Leonid Melamed was elected as MTS’ President and CEO

On June 14, 2006, the Extraordinary General Meeting of Shareholders (EGM) terminated the powers of the current President and CEO, Mr. Vasilly Sidorov, and elected Mr. Leonid Melamed as the Company’s new President and CEO. Mr. Melamed has been the acting President and CEO of MTS since April 14, 2006.

15.06.2006
MTS’ Extraordinary General Meeting of Shareholders Decision

MOSCOW, RUSSIAN FEDERATION — JUNE 15, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THE DECISION MADE AT ITS EXTRAORDINARY MEETING OF SHAREHOLDERS.

15.06.2006
Financial Results for the First Quarter Ended March 31, 2006

Moscow, Russian Federation — June 15, 2006 — Mobile TeleSystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its first quarter 2006 financial and operating results.

14.06.2006
Information Message from Mobile TeleSystems OJSC and its Subsidiaries

From July 1, 2006, MTS will launch new supplements to its «Terms of MTS service provision» to provide its users with mobile services according to the new changes.

09.06.2006
MTS Launches Fixed USD Exchange Rate

From June 20, 2006, MTS will charge its users under a fixed USD exchange rate.

08.06.2006
Notice to MTS Users with Direct Numbers

Due to changes in the communication law* all MTS subscribers with direct Moscow numbers (those using the 495 code) will be able to use both the direct Moscow number and the federal number (the new 985 code) from July 1, 2006.

08.06.2006
New Address of MTS’ «At Sadovoi-Karetnoi» Salon-Shop

MTS’ «At Sadovoi-Karetnoi» salon-shop will move to 20/6, Sadovaya-Karetnaya.

08.06.2006
Closing of MTS’ «Nikoloyamsky» Salon-Shop

From July 1, 2006 MTS’ «Nikoloyamsky» salon-shop at 7/8, Nikoloyamskaya Ulitsa will be closed.

08.06.2006
Invitation to MTS’ First 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 First Quarter 2006 Financial and Operating Results on Thursday, June 15, 2006.

08.06.2006
MTS Announces Subscriber Growth Numbers for May 2006

MOSCOW, RUSSIAN FEDERATION — JUNE 8, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THAT ITS CONSOLIDATED SUBSCRIBER BASE REACHED 62.89 MILLION USERS ON MAY 31, 2006.

07.06.2006
MTS’ June Opening Hours

From 10 to 12 June, 2006 MTS’ salons-shops in Moscow and the Moscow region will be open as follows:

06.06.2006
MTS’ New <nobr>Salon-Shop</nobr> «V Vidnom»

MTS is pleased to announce the opening of a new salon-shop in Vidnoe in the Moscow region.

05.06.2006
Two NEC Phones at the Price of One Phone

From June1 to August 31, 2006, MTS offers its users to acquire two NEC N412i and NEC e121 phones at the NEC N412i price.

02.06.2006
MTS’ First Tariff Plan — Start First, Be First!

All incoming calls are free and the per minute fee for outgoing calls to all phones in the Moscow region is 0.07 USD.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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