May 2006

23.05.2006
MTS Announces Recommended Amount of Dividends

MOSCOW, RUSSIAN FEDERATION — MAY 23, 2006 — MOBILE TELESYSTEMS OJSC («MTS» — NYSE: MBT), THE LARGEST MOBILE PHONE OPERATOR IN RUSSIA AND THE CIS, ANNOUNCES THE RECOMMENDED AMOUNT OF DIVIDENDS.

23.05.2006
Closing of MTS’ Salon-Shop at 2, Novy Arbat

From June 1, 2006 MTS’ salon-shop at 2, Novy Arbat will be closed.

22.05.2006
MTS’ New <nobr>Salon-Shop</nobr> in Khimki

MTS is pleased to announce the opening of a new salon-shop in Khimki in the Moscow region.

16.05.2006
Renovation of MTS’ Novoarbatsky Salon-Shop

MTS’ salon-shop at 15, Novy Arbat will be closed for renovation until May 31, 2006.

10.05.2006
MTS at the Svyaz-expocomm 2006

MTS welcomes you to the Svyaz-Expocomm 2006 exposition from 10-13 May, 2006 at the Expocenter, Krasnaya Presnya.

10.05.2006
New Symbol For MTS’ Quality

IN LINE WITH THE IMPLEMENTATION OF A PORTAL BRAND BY THE SISTEMA TELECOM GROUP OF COMPANIES, MTS INTRODUCES ITS RENEWED BRAND.

10.05.2006
MTS Announces Subscriber Growth Numbers for April 2006

Moscow, Russian Federation — May 10, 2006 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 61.77 million users on April 30, 2006.

03.05.2006
MTS’ Guest Tariff Plan — International Calls Charged as Local!

Under MTS’ Guest tariff plan, call fees throughout Russia and the CIS are only 19 cents per minute and all incoming calls are free.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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