OREANDA-NEWS. June 20, 2011. Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the leading telecommunications provider in Russia and the CIS, has today filed its annual report on Form 20-F for the fiscal year ended December 31, 2010 with the United States Securities and Exchange Commission.

The document can also be found at http://www.mtsgsm.com/resources/annual_reports/ of the Investor Relations section. Hard copies of the document with the Company’s complete audited financial statements will be available free of charge to shareholders upon request.

Mobile TeleSystems OJSC ("MTS") is the leading telecommunications group in Russia, Eastern Europe and Central Asia, offering mobile and fixed voice, broadband, pay TV as well as content and entertainment services in one of the world's fastest growing regions. Including its subsidiaries, the Group services over 108.6 million mobile subscribers in Russia, Ukraine, Uzbekistan, Turkmenistan, Armenia and Belarus, a region that boasts 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 the MTS Group can be found at www.mtsgsm.com.