January 2006

31.01.2006
Change of Moscow code to 495!

Please note that the 095 Moscow telephone code will no longer be available as from February 1, 2006.

31.01.2006
Change of Moscow code to 495!

Please note that the 095 Moscow telephone code will no longer be available as from February 1, 2006.

31.01.2006
Change of Moscow code to 495!

Please note that the 095 Moscow telephone code will no longer be available as from February 1, 2006.

31.01.2006
Change of Moscow code to 495!

Please note that the 095 Moscow telephone code will no longer be available as from February 1, 2006.

25.01.2006
Announcement of the Date of the Extraordinary General Meeting of Shareholders

Moscow, Russian Federation — January 25, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces the date of the extraordinary general meeting of shareholders.

23.01.2006
MTS.Bonus Promotion for all JEANS Users!

Credit your account and receive a 10 USD bonus!

19.01.2006
MTS’ “JEANS-Pepsi” tariff plan offers an incredibly low charge for outgoing SMS messages!

MTS’ JEANS-Pepsi tariff plan offers an incredibly low charge for outgoing SMS messages!

19.01.2006
MTS’ “JEANS-Pepsi” tariff plan offers an incredibly low charge for outgoing SMS messages!

MTS’ JEANS-Pepsi tariff plan offers an incredibly low charge for outgoing SMS messages!

17.01.2006
MTS Announces Subscriber Growth Numbers for December 2005

Moscow, Russian Federation – January 17, 2006 – Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 58.19 million users on December 31, 2005.

16.01.2006
MTS’ Reduced Roaming Rates in Uzbekistan

MTS launches its reduced roaming rates in Uzbekistan.

16.01.2006
MTS’ Reduced Roaming Rates in Uzbekistan

MTS launches its reduced roaming rates in Uzbekistan.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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