February 2005

Up to 50 Free SMS Messages for New Super JEANS Users on 23 February!

To celebrate 23 February, MTS will give between 25 to 50 outgoing SMS messages to all new Super JEANS users — for free!

MTS Wins Narodnaya Marka Top Brand Award!

MTS named the most popular cellular operator in Russia at the annual Narodnaya Marka Awards Gala!

50% SMS Discount for New Super JEANS Users!

MTS announces a great 50% SMS discount for all users who sign up for the Super JEANS tariff plan between 10 February and March 10, 2005!

MTS Announces Subscriber Growth Numbers for January 2005

Moscow, Russian Federation — February 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 35.94 million users on January 31, 2005.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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