July 2005

26.07.2005
MTS Increases Ownership in Its Subsidiary in the Urals to 100%

Moscow, Russian Federation — July 26, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the acquisition of the remaining 0.16% of Uraltel, a mobile phone operator in the Sverdlovsk region in the Urals.

25.07.2005
GPRS Roaming News: Australia, Caribbean Sea basin countries

From July 25, 2005, MTS will launch its roaming services with Optus Mobile Pty Ltd, Australia.

25.07.2005
0934 — Surprise a Friend with a “Song as a Gift”!

Call 0934 and send a song throughout Russia!

14.07.2005
The MTS Trade Mark Enters Severnaya Osetia

Telesot-Alania Joinjs the Unified MTS Network.

08.07.2005
MTS Announces Subscriber Growth Numbers for June 2005

Moscow, Russian Federation — July 8, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 44.07 million users on June 30, 2005.

06.07.2005
MTS' Subsidiary in Turkmenistan Resumes Operations

Moscow, Russia — July 5, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT) announces that it has reached an agreement with the Communications Ministry of Turkmenistan for its subsidiary to resume operations in the country.

04.07.2005
04.07.2005
MTS’ Special Summer Discount

From June to September 2005, MTS’ Special Summer Discount will be available to users in the Moscow region on the “VIP 1000”, “VIP 1000 (federal)”, “VIP 1600”, “VIP 1600 (federal)”, “1000 for 100”, “Exclusive” and “Exclusive (federal)” tariff plans.

01.07.2005
Merger of Eight MTS Subsidiaries Completed

Moscow, Russia — July 1, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the completion of the merger of eight subsidiaries into MTS.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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