May 2003

Change of the 902 code for the 916 code

Under the instruction of the Russian Communications Ministry (instruction №163 from July 6, 2001) “Mobile TeleSystems” OJSC announces the change of the 902 code for the 916 code in federal numbers of MTS users served by the Moscow switches from 6 to 20 June, 2003. In the given period the 902 code of all federal numbers will be automatically changed for the 916 code. The last seven digits of the user’s number remain the same!

The switch launch in Pskov city

Attention to MTS users based in Moscow and the Moscow region, Vladimir, Kaluga, Pskov, Ryazan, Tula regions served by the switches in Moscow! From June 1, 2003 MTS launches a new switch in Pskov city. Due to this event some changes concerning dialing and charging take place.

Financial Results for the Fourth Quarter 2002 and the Year Ended 31 st December 2002

Moscow, Russian Federation — May 20, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and Central and Eastern Europe1, today announced its financial results for the fourth quarter and the year ended December 31, 2002.

MTS hits the ten million user mark!

At the press-conference held in Moscow on May 14 at “Svyaz-Expocomm-2003” MTS President Mikhail Smirnov announced that the number of MTS users had exceeded 10 million people.


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