April 2006

28.04.2006
MTS Wins Ruling in BVI

Moscow, Russian Federation — April 28, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that the latest ruling on the receiver by the Eastern Caribbean Court of Appeal was won by MTS.

28.04.2006
Attention MTS Universal Users!

MTS announces changes to outgoing call fees on the Universal tariff plan.

27.04.2006
MTS Announces its AGM Date and Nominations for the Company’s Board of Directors

Moscow, Russia — April 27, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the date of its annual general meeting of shareholders and the nominees for the Company’s Board of Directors.

25.04.2006
Unlimited Weekends for Corporate Users

Call whoever you want and speak as long as you want about whatever you like — all local and mobile calls are free on weekends!

25.04.2006
Unlimited Weekends for Profi Users

Call whoever you want and speak as long as you want about whatever you like — all local and mobile calls are free on weekends!

25.04.2006
All Incoming Calls Become Free!

From April 25, 2006 all incoming calls on the Universal tariff plan will be free!

25.04.2006
Unlimited Weekends for Profi Users

Call whoever you want and speak as long as you want about whatever you like — all local and mobile calls are free on weekends!

25.04.2006
All Incoming Calls Become Free!

From April 25, 2006 all incoming calls on the Universal tariff plan will be free!

24.04.2006
MTS Signs a $1.33 billion Syndicated Loan Agreement

Moscow, Russian Federation — April 24, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that on April 21, 2006 it signed a $1.33 billion syndicated loan facility with leading international financial institutions.

24.04.2006
MTS Appoints a Chief Financial Officer

Moscow, Russian Federation — April 24, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the appointment of Mr Vsevolod Rozanov as the Company’s new Vice-President, Chief Financial Officer (CFO).

21.04.2006
MTS’ Roaming Rates Become Easier

Form May 1, 2006 MTS will launch the single rates for international and national roaming services

21.04.2006
MTS’ Roaming Rates Become Easier

Form May 1, 2006 MTS will launch the single rates for international and national roaming services

21.04.2006
MTS’ Roaming Rates Become Easier

Form May 1, 2006 MTS will launch the single rates for international and national roaming services

20.04.2006
Unlimited Weekends — Gift for New MTS Users!

Sign up to MTS’ network and find out real unlimited communication!

20.04.2006
Unlimited Weekends — Gift for New MTS Users!

Sign up to MTS’ network and find out real unlimited communication!

18.04.2006
General Update on Bitel

Moscow, Russian Federation — April 18, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the latest developments concerning Bitel.

18.04.2006
Closing of MTS’ Office in Klin

MTS’ sales and customer care office in the Moscow region, Klin, Build.3/2, Gagarina Ulitsa will be closed from May 1, 2006.

17.04.2006
MTS’ GPRS-Roaming Service: Provision will Become Simpler

From April 17, 2006 the GPRS-roaming service will be automatically activated jointly with the international and national roaming service!

13.04.2006
MTS’ Extraordinary Board of Directors Meeting Decisions

Moscow, Russian Federation — April 13, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the decisions made at its Extraordinary Board of Directors Meeting.

13.04.2006
Mr. Melamed was appointed as MTS’ acting President and CEO

 

On April 13, 2006, MTS’ Board of Directors appointed Mr. Melamed, previously the Director of the ROSNO Insurance Group, as MTS’ acting President and CEO.

11.04.2006
MTS Announces Subscriber Growth Numbers for March 2006

Moscow, Russian Federation — April 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 61.05 million users on March 31, 2006.

04.04.2006
Merger of Nine MTS Subsidiaries Completed

Moscow, Russian Federation — April 4, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the completion of the merger of nine subsidiaries into MTS.

04.04.2006
Unlimited Weekends — Call as Much as You Want!

Call whoever you want and speak as long as you want about whatever you like — all local and mobile calls are free on weekends!

04.04.2006
Unlimited Weekends — Call as Much as You Want!

Call whoever you want and speak as long as you want about whatever you like — all local and mobile calls are free on weekends!

04.04.2006
Unlimited Weekends — Call as Much as You Want!

Call whoever you want and speak as long as you want about whatever you like — all local and mobile calls are free on weekends!

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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