June 2005

30.06.2005
MTS Celebrates Five Years as a Public Company

New York, June 30, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announced that Vassily Sidorov, President and CEO, will ring the Closing Bell at the New York Stock Exchange in celebration of the Company’s five-year anniversary as an NYSE-listed company.

29.06.2005
License of MTS’ Subsidiary in Turkmenistan Revoked

Moscow, Russia — June 29, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT) announces that the Ministry of Communications in Turkmenistan has revoked the mobile services license of US incorporated Barash Communications Technologies, Inc. (BCTI), a 51% stake of which was recently acquired by MTS.

27.06.2005
MTS Acquires BCTI to Enter Turkmenistan Market

Moscow, Russia — June 27, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired a 51% stake in Barash Communications Technologies, Inc. (BCTI), a U.S. company that is the leading mobile phone operator in the Republic of Turkmenistan.

24.06.2005
22.06.2005
MTS’ Annual General Meeting Decisions

Moscow, Russia — June 22, 2005 — 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 of the Company’s shareholders that was held yesterday.

07.06.2005
02.06.2005
MTS Increases Ownership in its Subsidiary in the Far East of Russia to 100%

Moscow, Russian Federation — June 2, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired an additional 24% of Gorizont RT, a GSM mobile phone operator in the Republic of Sakha (Yakutia) in the Far East of Russia.

01.06.2005
Financial Results for the First Quarter Ended March 31, 2005

Moscow, Russian Federation – June 1, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its first quarter 20051 financial and operating results.

01.06.2005
Financial Results for the First Quarter Ended March 31, 2005

Moscow, Russian Federation – June 1, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its first quarter 20051 financial and operating results.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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