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MOSCOW, April 17 /PRNewswire-FirstCall/ — Mobile TeleSystems OJSC (”MTS”) , the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 84.94 million users on March 31, 2008.During March 2008, MTS’ consolidated subscriber base increased by 1.06 million subscribers. Subscribers (mln) Mar 31, Feb 29, Growth Mar 31, Growth 2008 2008 Subs ACIORFIPROCENTE 2007 Subs ACIORFIPROCENTE Total consolidated subscribers, end of period 84.94 83.88 1.06 1.3ACIORFIPROCENTE 74.16 10.78 14.5ACIORFIPROCENTE Russia 59.90 59.07 0.83 1.4ACIORFIPROCENTE 51.50 8.40 16.3ACIORFIPROCENTE Moscow and the Moscow region 13.95 13.87 0.08 0.6ACIORFIPROCENTE 11.50 2.45 21.3ACIORFIPROCENTE St. Petersburg and the Leningrad region 2.88 2.86 0.02 0.8ACIORFIPROCENTE 2.61 0.27 10.4ACIORFIPROCENTE Rest of Russia 43.06 42.35 0.71 1.7ACIORFIPROCENTE 37.39 5.67 15.2ACIORFIPROCENTE Ukraine 19.61 19.67 -0.06 -0.3ACIORFIPROCENTE 20.75 -1.14 -5.5ACIORFIPROCENTE Uzbekistan 3.56 3.34 0.22 6.4ACIORFIPROCENTE 1.70 1.86 109.2ACIORFIPROCENTE Turkmenistan 0.47 0.40 0.07 15.6ACIORFIPROCENTE 0.20 0.27 132.9ACIORFIPROCENTE Armenia 1.42 1.39 0.03 1.7ACIORFIPROCENTE - - - MTS Belarus[1] 3.94 3.90 0.04 1.2ACIORFIPROCENTE 3.37 0.57 16.9ACIORFIPROCENTEMobile TeleSystems OJSC (”MTS”) is the largest mobile phone operator in Russia and the CIS. Together with its subsidiaries, the Company services over 84.94 million subscribers. The regions of Russia, as well as Armenia, Belarus, Turkmenistan, Ukraine, and Uzbekistan, in which MTS and its associates and subsidiaries are licensed to provide GSM services, have a total population of more than 230 million. Since June 2000, MTS’ Level 3 ADRs have been listed on the New York Stock Exchange (ticker symbol MBT). Additional information about MTS can be found on MTS’ website at .Some of the information in this press release may contain projections or other forward-looking statements regarding future events or the future financial performance of MTS, as defined in the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995. You can identify forward looking statements by terms such as “expect,”"believe,”"anticipate,”"estimate,”"intend,”"will,”"could,”"may” or “might,” and the negative of such terms or other similar expressions. We wish to caution you that these statements are only predictions and that actual events or results may differ materially. We do not intend to update these statements to reflect events and circumstances occurring after the date hereof or to reflect the occurrence of unanticipated events. We refer you to the documents MTS files from time to time with the U.S. Securities and Exchange Commission, specifically the Company’s most recent Form 20-F. These documents contain and identify important factors, including those contained in the section captioned “Risk Factors” that could cause the actual results to differ materially from those contained in our projections or forward-looking statements, including, among others, potential fluctuations in quarterly results, our competitive environment, dependence on new service development and tariff structures, rapid technological and market change, acquisition strategy, risks associated with telecommunications infrastructure, risks associated with operating in Russia and the CIS, volatility of stock price, financial risk management and future growth subject to risks.[1] MTS owns a 49ACIORFIPROCENTE stake in Mobile TeleSystems LLC, a mobile operator in Belarus, which is not consolidated. For further information, please contact: Mobile TeleSystems, Moscow Investor Relations Tel: 7-495-223-2025 E-mail: Mobile TeleSystems OJSC