February 2003

28.02.2003
MTS Acquires a Controlling Stake in UMC

Moscow, Russian Federation — February 28, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile cellular operator in Russia and Central and Eastern Europe today announces that a shareholders meeting of Ukrainian Mobile Communications (UMC) approved the transfer of a 57.7% stake in UMC to MTS.

24.02.2003
MTS. Optima tariff plans

On February 24, 2003 MTS launched for its users in Moscow MTS. Optima tariff plans designed for those who need high quality communications with substantial discounts. The MTS. Optima group provides five tariff plans with federal numbers: Optima Day, Optima Evening, Optima Universal, Optima+ 100 and Optima+ 200.

19.02.2003
“MTS. Business” tariff plans

On February 19, 2003 MTS launches for its Moscow users MTS. Business tariff plans that are designed for those who use actively mobile communications for both private and personal purposes. MTS. Business includes 4 tariff plans with both direct and federal number.

18.02.2003
18.02.2003
14.02.2003
MTS. VIP tariff plans

On February 14, 2003 MTS launches for Moscow users the set of MTS. VIP tariff plans with direct Moscow numbers: VIP 1000, VIP 1600 and Exclusive.

13.02.2003
MTS unified tariff system

From February 14, 2003 MTS starts launching the new unified system of tariff plans across the MTS nationwide network in Russia. The new tariffs are designed to target different groups and consist of three groups: MTS. Optima, MTS. Business and MTS. VIP.

13.02.2003
MTS Introduces New Tariff Plans Across its Nationwide Network in Russia

Moscow, Russian Federation — February 13, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile cellular operator in Russia, today launches a new set of tariff plans. The new tariffs are designed to target different groups of subscribers and will be introduced across the MTS network during February 2003.

06.02.2003

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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