February 2004

Changing of number dialing in the Vladimir region

Attention to MTS users in Moscow, the Moscow and Vladimir regions, as well as in the Kaluga, Pskov, Ryazan and Tula regions served by MTS’ switchboards in Moscow!

The campaign's results: “Send a voice Valentine's message and win a romantic dinner for two!”

Ladies and gentlemen!We acknowledge everybody who dialed 0838 and participated in our St. Valentine's campaign at the entertainment channel "Leisure".

Security is guaranteed by “Mobile Bodyguard”

Ladies and gentlemen!Only from February 20 to March 20 a 50 % discount applies for subscription to «Mobile Bodyguard»

MTS Further Significantly Expands its License Footprint in Russia

Moscow, Russian Federation — February 17, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia, Eastern and Central Europe1, today announces a significant expansion in its license area, which now covers almost all of Russia’s territory.

Contest “SMS-Carnival”

Ladies and gentlemen! Add bright colors into your life and participate in the carnival!

Romantic dinner with candles. Call 0838. Your Valentine’s message

Ladies and gentlemen! From 11 to 14 February, 2004 you are offered to send a voice Valentine’s message by using the entertainment channel “Leisure-0838”, and you can win a romantic dinner for two in a restaurant in Moscow.

Don’t be bored! — Call 0847. Play and get awards!

Ladies and gentlemen! From 5 to 29 February, 2004 you are offered to participate and win in the contest “Don’t be bored!”.

Polyphony and color images for you!

Novelty in the world of polyphonic ring tones and color images for you!

Users of the Far East join the MTS unified network

The “MTS” brand enters Sakhalin and Primorie.

MTS integrates the Irkutsk region into its intranet roaming zone

From February 9, 2004 the Irkutsk region covered by the MTS’ subsidiary “Primtelefon” cellular operator is integrated into the MTS intranet roaming zone.

MTS launches the network in Irkutsk

MTS starts operations in Irkutsk

MTS Announces Subscriber Growth Numbers for January 2004

Moscow, Russian Federation — February 05, 2004 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and Ukraine, announces that its consolidated subscriber base reached 17.44 million users on January 31, 2004.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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