MTS announces subscriber growth numbers for December 2008

19 January 2009

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 91.33 million users on December 31, 2008.

During December, MTS’ consolidated subscriber base increased by 1.66 million subscribers with 1.36 million added in Russia.

Subscribers (mln) Dec 31, 2008 Nov 30, 2008 Growth

Dec 31, 2007

Total consolidated subscribers, end of period 91.33 89.68 1.66 1.8% 81.97 9.36 11.4%
Russia 64.63 63.27 1.36 2.1% 57.43 7.20 12.5%
  Moscow and the
  Moscow region
14.91 14.65 0.27 1.8% 13.45 1.46 10.9%
  St. Petersburg and the   Leningrad region 3.25 3.15 0.10 3.3% 2.82 0.43 15.4%
  Rest of Russia 46.46 45.48 0.98 2.2% 41.16 5.30 12.9%
Ukraine 18.115 18.103 0.012 0.07% 20.00 (1.89) (9.4%)
Uzbekistan 5.65 5.49 0.16 2.8% 2.80 2.85 101.7%
Turkmenistan 0.93 0.87 0.06 7.0% 0.36 0.57 157.6%
Armenia 2.02 1.94 0.07 3.7% 1.38 0.64 46.2%
MTS Belarus1 4.32 4.23 0.09 2.1% 3.80 0.52 13.7%


MTS owns a 49% 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

Mobile TeleSystems OJSC (“MTS”) is the largest mobile phone operator in Russia and the CIS. Together with its subsidiaries, the Company services over 91.33 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).

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.

Contact investor relations:

+ 7 495 223 20 25

MTS Investor Relations
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