August 2010

31.08.2010
MTS Confirms Expiration Dates for Voluntary Tender Offer to Comstar Shareholders

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that MTS’ Voluntary Tender Offer (“VTO”) to COMSTAR – United TeleSystems JSC (“Comstar” – LSE: CMST) shareholders will close at 17.00 EST on September 8, 2010 for Global Depositary Receipt (“GDR”) holders in advance of the closing on September 21, 2010 for all other Comstar shareholders.

27.08.2010
MTS Acquires Stake in Metro-Telecom

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that it has acquired a 95% stake in Metro-Telecom CJSC (Metro-Telecom) from Invest-Svyaz CJSC, a wholly owned subsidiary of Sistema, the largest diversified public financial corporation in Russia and the CIS and majority owner of MTS.

26.08.2010
Mobile TeleSystems Announces Financial Results for the Second Quarter Ended June 30, 2010

Moscow, Russian Federation – Mobile TeleSystems OJSC («MTS» – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, today announces its unaudited US GAAP financial results for the three months ended June 30, 2010.

26.08.2010
Ad Hoc Notice

Moscow, Russian Federation – Mobile TeleSystems OJSC (the “Company” or “MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that “COMSTAR – United TeleSystems” JSC (“Comstar” - LSE: CMST), a majority-owned subsidiary of MTS, has released its second quarter 2010 financial and operating results on August 25, 2010.

24.08.2010
MTS Lowers Interest Rates on Sberbank Financing

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that it has reached an agreement with Sberbank to lower interest rates on RUB 53 billion in loans.

20.08.2010
Second Quarter 2010 Financial Results Announcement and Conference Call

The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s Second Quarter 2010 Financial and Operating Results on Thursday, August 26, 2010.

02.08.2010
S&P Revises Outlook from Stable to Positive

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that Standard & Poor's Ratings Services has revised upward its Outlook on the Company from Stable to Positive and affirmed existing bond ratings at BB level.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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