October 2005

30.10.2005
0725 — Fortune Tellling

Welcome to an unknown magic world!

28.10.2005
0744 — Only You and Me

Magic and passion — she is waiting for you!

21.10.2005
MTS’ New Tariff Plans

MTS updates its tariff plans.

17.10.2005
MTS Announces a Change in Management

Moscow, Russian Federation — October 17, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the departure of its Chief Financial Officer, Nikolai Tsekhomsky.

10.10.2005
MTS Announces Subscriber Growth Numbers for September 2005

Moscow, Russian Federation — October 10, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 50.36 million users on September 30, 2005.

05.10.2005
JEANS OPEN: Free Incoming Calls!

JEANS users on the Super JEANS tariff plan are invited to participate in the “JEANS Open” promotion.

03.10.2005
MTS Announces New Appointments and Changes to its Management Structure

Moscow, Russian Federation — October 3, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, enters a new phase in the optimization of the Company’s management structure and announces the creation of a number of new management positions.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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