August 2003

28.08.2003
MTS Completes Acquisition of 50% in Primtelefon

Moscow, Russian Federation — August 28, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia in terms of subscribers, today completed a previously announced transaction to acquire a 50% stake in Primtelefon, a cellular operator in the Far East and Siberian regions of Russia.

27.08.2003
Altai krai: new low tariffs

From August 27, 2003 low tariffs for MTS intranet roaming apply in Altai krai. MTS low roaming tariffs apply now in 57 Russia's regions as well as in Belarus and Ukraine.

26.08.2003
Mobile TeleSystems (MTS) Financial Results for the Second Quarter Ended June 30, 2003

Moscow, Russian Federation — August 26, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and Eastern Europe1, today announces its financial results for the second quarter ended June 30, 2003.

22.08.2003
MTS Completes Acquisition of Sibchallenge

Moscow, Russian Federation — August 22, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia in terms of subscribers, today announces the completion of an earlier-announced transaction to acquire a 100% stake in Sibchallenge, a mobile phone operator in the Krasnoyarsk region of Russia.

19.08.2003
MTS starts its operations in Saratov

MTS announces the launch of its operations in the Saratov region, one of the largest regions in the Volga Federal District.

19.08.2003
MTS launches the network in the Saratov region: new low tariffs

From August 19, 2003 MTS low tariffs for intranet roaming apply in the Saratov region. Thus, MTS low roaming tariffs apply now in 56 Russia's regions, as well as in Belarus and Ukraine.

14.08.2003
MTS Completes Acquisition of Uraltel

Moscow, Russian Federation — August 14, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia in terms of subscribers, today completed a previously announced transaction to acquire an additional 46.65% stake in Uraltel, the largest mobile phone operator in the Sverdlovsk region of Russia.

12.08.2003
12.08.2003
MTS Signs Agreement to Acquire Stakes in Five Regional Mobile Operators

Moscow, Russian Federation — August 12, 2003 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone in Russia in terms of subscribers, today announced a series of related transactions that will give it a substantial equity interest in five regional mobile phone companies.

11.08.2003
Vassily Sidorov to Head MTS

Moscow, Russian Federation — August 11, 2003 — Vassily Sidorov has been nominated as the new President and CEO of Mobile TeleSystems OJSC ("MTS" — NYSE: MBT), the largest mobile phone operator in Russia1. He will replace Mikhail Smirnov who leaves to head MGTS, one of Russia's largest fixed-line operators.

01.08.2003
01.08.2003
Mobile TeleSystems Annual General Meeting Statement

Moscow, Russian Federation, 30 June 2003 — OJSC Mobile TeleSystems today held an Annual General Meeting of the Сompany’s shareholders.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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