March 2006

29.03.2006
MTS’ Extraordinary General Meeting Decisions

Moscow, Russian Federation — March 29, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the decisions made at its Extraordinary General Meeting (EGM) held on March 28, 2006.

29.03.2006
New MTS Office in Moscow: Bolshaya Semenovskaya Ulitsa

MTS announces the opening of a new sales and customer care office at Bolshaya Semenovskaya Ulitsa.

28.03.2006
New MTS Wi-Fi Hot Spots!

MTS is increasing the number of its wireless Internet access outlets!

28.03.2006
New MTS Wi-Fi Hot Spots!

MTS is increasing the number of its wireless Internet access outlets!

27.03.2006
Financial Results for the Fourth Quarter and Full-Year Ended December 31, 2005

Moscow, Russian Federation – March 27, 2006 – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its fourth quarter and full-year 20051 financial and operating results.

20.03.2006
Fourth Quarter and Full Year 2005 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 2005 Financial and Operating Results on Monday, March 27, 2006.

16.03.2006
MTS Announces Subscriber Growth Numbers for February 2006

Moscow, Russian Federation — March 16, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 60.31 million users on February 28, 2006.

16.03.2006
MTS’ Be More Practical Tariff Plan: only 3 Cents per SMS!

Send SMS messages twice as much to MTS users!

16.03.2006
MTS’ Be More Practical Tariff Plan: only 3 Cents per SMS!

Send SMS messages twice as much to MTS users!

14.03.2006
Closing of MTS' Office at Leningradskoe Shosse

From March 14, 2006 MTS’ sales and customer care office at Build.16, 1 Leningradskoe Shosse will be closed.

13.03.2006
Renovation of MTS’ Offices

MTS’ sales and customer care offices at 60, Varshavskoe Shosse and Build.18, 5 Teterinsky Pereulok will be closed for renovation.

09.03.2006
MTS. Bonus Promotion for all MTS Users: Credit Your Account with 5 USD and Receive a 10 USD Bonus!

An excellent bonus to pay for mobile services for all MTS users!

09.03.2006
MTS. Bonus Promotion for all MTS Users: Credit Your Account with 5 USD and Receive a 10 USD Bonus!

An excellent bonus to pay for mobile services for all MTS users!

09.03.2006
MTS. Bonus Promotion for all MTS Users: Credit Your Account with 5 USD and Receive a 10 USD Bonus!

An excellent bonus to pay for mobile services for all MTS users!

09.03.2006
MTS. Bonus Promotion for all MTS Users: Credit Your Account with 5 USD and Receive a 10 USD Bonus!

An excellent bonus to pay for mobile services for all MTS users!

07.03.2006
MTS’ Signing and Service Terms Will Become Easier for Corporate and VIP-Users

From March 9, 2006, MTS offers its customers on the unlimited tariff plans and VIP-users the easier signing and service terms.

07.03.2006
Change of MTS’ Intranet Roaming Rates

From March 23, 2006 MTS will offer its users in Moscow and the Moscow region the single intranet roaming call charging.

07.03.2006
MTS’ Signing and Service Terms Will Become Easier for Corporate and VIP-Users

From March 9, 2006, MTS offers its customers on the unlimited tariff plans and VIP-users the easier signing and service terms.

07.03.2006
Change of MTS’ Intranet Roaming Rates

From March 23, 2006 MTS will offer its users in Moscow and the Moscow region the single intranet roaming call charging.

07.03.2006
Change of MTS’ Intranet Roaming Rates

From March 23, 2006 MTS will offer its users in Moscow and the Moscow region the single intranet roaming call charging.

07.03.2006
Change of MTS’ Intranet Roaming Rates

From March 23, 2006 MTS will offer its users in Moscow and the Moscow region the single intranet roaming call charging.

03.03.2006
Change of GPRS Rates

GPRS-Internet data transmission fee will be substantially lower at the night period. Outgoing/incoming data transmission fee will be only 0.01 USD per 100 kb from 00:00—08:00.

03.03.2006
Change of GPRS Rates

GPRS-Internet data transmission fee will be substantially lower at the night period. Outgoing/incoming data transmission fee will be only 0.01 USD per 100 kb from 00:00—08:00.

03.03.2006
Change of GPRS Rates

GPRS-Internet data transmission fee will be substantially lower at the night period. Outgoing/incoming data transmission fee will be only 0.01 USD per 100 kb from 00:00—08:00.

01.03.2006
MTS’ “Annual Contract” — Visible Saving

MTS offers its corporate users to participate in the new “Annual Contract” program and receive a 15% or 20% discount on all incoming and outgoing local and mobile calls!

01.03.2006
MTS’ “Annual Contract” — Pay Less

MTS offers its users to participate in the new “Annual Contract” program and receive a 15% discount on all incoming and outgoing calls! Benefit from a 15% discount and pay less for the whole year!

01.03.2006
MTS’ “Annual Contract” — Pay Less

MTS offers its users to participate in the new “Annual Contract” program and receive a 15% discount on all incoming and outgoing calls! Benefit from a 15% discount and pay less for the whole year!

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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