November 2005

30.11.2005
Change of Telephone Codes

From December 1, 2005 the telephone codes for Russian cities will change.

29.11.2005
29.11.2005
Attn: JEANS Users

“Itemized Balance Report” service for JEANS users in Moscow and the Moscow region will be cancelled on January 1, 2006.

25.11.2005
MMS Exchange: MTS (Moscow and Central Regions, Russia).

From November 25, 2005, MMS exchange will be available between MTS (Moscow and Central Regions, Russia), Uzdunrobita (Uzbekistan) and UMC (Ukraine) users.

24.11.2005
23.11.2005
Reduced MMS Charges in Moscow and the Moscow region!

MTS is reducing its charges for outgoing MMS messages.

23.11.2005
Financial Results for the Third Quarter Ended September 30, 2005

Moscow, Russian Federation — November 23, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, today announces its financial and operating results for the third quarter of 20051 featuring strong financial performance and robust subscriber growth.

21.11.2005
MTS’ “New Year” Tariff Plan – only 2 cents/min in the home network!

The season of giving has started! MTS’ “New Year” tariff plan will benefit users making calls during the coming holiday period.

16.11.2005
Third Quarter 2005 Financial Results Announcement and Conference Call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Third Quarter 2005 Financial and Operating Results on Wednesday, November 23, 2005.

16.11.2005
MTS Announces the Launch of its Network in the Three Regions of the North Caucasus

MTS announces the launch of its network in Ingushetia, Kabardino-Balkaria and Karachaevo-Cherkesia.

15.11.2005
MTS.CARD Maestro + Gift

Receive a gift by participating in the MTS.CARD Maestro + 250 Rubles for MTS services as a gift promotion!

15.11.2005
MTS Announces A New Appointment

Moscow, Russian Federation – November 15, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the appointment of Grzegorz Esz to the position of Deputy Chief Marketing Officer.

11.11.2005
0943 — Discover More Today!

Today is a remarkable day! MTS’ “Today” service will tell you all about the most interesting events happening today.

09.11.2005
MTS’ New Game — “Kamikaze 2.Samurai Way”

Download the new Kamikaze 2.Samurai Way game and receive a gift! Send SMS message “557” to quick dial 4449 to order the game!

09.11.2005
MTS Announces Subscriber Growth Numbers for October 2005

Moscow, Russian Federation – November 9, 2005 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 52.4 million users on October 31, 2005.

08.11.2005
0676 — “Hungry 2” Quiz: Win a Trip to New York!

Participate in the Hungry 2 quiz for a chance to win a trip to New York!

07.11.2005
0847 — Play Tricks on Police Day!

Play a practical joke on friends or send them the “Our Service is Dangerous and Difficult” song.

02.11.2005
Reduced i-mode charges!

MTS’ i-mode data fee is now only 0.01 USD per 10 kb!

01.11.2005
MTS Consolidates Ownership in its Subsidiary Operating in Turkmenistan

Moscow, Russia – November 01, 2005 – Mobile TeleSystems OJSC (“MTS” - NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that it has acquired the remaining 49% stake in Barash Communications Technologies, Inc. (BCTI), a U.S. company that is the leading mobile phone operator in the Republic of Turkmenistan.

01.11.2005
MTS’ Holiday Opening Hours: 4 November

On November 4, 2005, MTS’ sales and customer care offices in Moscow and the Moscow region will be open as follows:

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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