MTS Announces Subscriber Growth Numbers for March 2008

MOSCOW, April 17 /PRNewswire-FirstCall/ -- Mobile TeleSystems OJSC
("MTS") (NYSE: MBT), 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 % 2007 Subs %

Total
consolidated
subscribers, end
of period 84.94 83.88 1.06 1.3% 74.16 10.78 14.5%
Russia 59.90 59.07 0.83 1.4% 51.50 8.40 16.3%
Moscow and the
Moscow region 13.95 13.87 0.08 0.6% 11.50 2.45 21.3%
St. Petersburg
and the Leningrad
region 2.88 2.86 0.02 0.8% 2.61 0.27 10.4%
Rest of Russia 43.06 42.35 0.71 1.7% 37.39 5.67 15.2%
Ukraine 19.61 19.67 -0.06 -0.3% 20.75 -1.14 -5.5%
Uzbekistan 3.56 3.34 0.22 6.4% 1.70 1.86 109.2%
Turkmenistan 0.47 0.40 0.07 15.6% 0.20 0.27 132.9%
Armenia 1.42 1.39 0.03 1.7% - - -
MTS Belarus[1] 3.94 3.90 0.04 1.2% 3.37 0.57 16.9%

Mobile 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
http://www1.mtsgsm.com.
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 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
E-mail: ir@mts.ru

SOURCE Mobile TeleSystems OJSC

For further information, please contact: Mobile TeleSystems, Moscow Investor
Relations, Tel: +7-495-223-2025, E-mail: ir@mts.ru