FORM 6-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Issuer
March 19, 2013

Pursuant to Rule 13a-16 or 15d-16 of
the Securities Exchange Act of 1934

Commission file number:  333-12032

Mobile TeleSystems OJSC

(Exact name of Registrant as specified in its charter)

Russian Federation

(Jurisdiction of incorporation or organization)

4, Marksistskaya Street
Moscow 109147
Russian Federation

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F   x   Form 40-F   o

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes   o   No   x

Press release

Mobile TeleSystems Announces Financial Results for the Fourth Quarter and Full Year Ended December 31, 2012

March 19, 2013

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 and full year ended December 31, 2012.

Key Financial Highlights of Q4 2012 and FY 2012

·                  Consolidated revenues up 1.1% q-o-q to $3,168 million and up 1.0% y-o-y to $12,436 million

·                  Consolidated adjusted OIBDA(1) of $1,288 million down 6.6% q-o-q with 40.7% adjusted OIBDA margin and up 3.0% y-o-y to $5,300 million with 42.6% adjusted OIBDA margin

·                  Consolidated net income(2) of $547 million in Q4 2012 and a net income of $1,007 million in FY 2012

·                  Free cash-flow(3) growth of 25% to $1.3 billion for FY 2012

Key Corporate and Industry Highlights

·                  Acquired Pilot LLC and TVKiK LLC, providing fixed broadband and pay-TV services in the Kursk Oblast, from private investors. The purchase price, including the net debt of both companies, amounts to RUB 90.7 million

·                  Acquired ZhelGorTeleCom CJSC, the leading fixed broadband provided in Zheleznogorsk in the Kursk Oblast, from private investors. The purchase price, including net debt, amounts to RUB 152 million

·                  Signed a non-binding indicative offer between MTS, MTS Bank and Sistema JSFC to purchase up to 25.095% stake in MTS Bank through a share issuance for up to RUB 5.09 billion

Commentary

Mr. Andrei Dubovskov, President and CEO of MTS, commented, “For the year 2012, Group revenues increased by 1% to $12.4 billion. Overall, we saw strong operating dynamics in our core Russian and Ukrainian markets, yet our Group top line performance was limited by a significant weakening of the Russian ruble versus the US dollar and the mid-year suspension of our operations in Uzbekistan. We continue to see growth in our markets driven by sustained voice usage and greater adoption of data products and services. We delivered both ARPU and usage growth in each of our core markets, a sign of Group’s excellence throughout the organization. In 2012, total revenues in Russia increased in ruble terms by 8% to RUB 338 billion driven by increased usage of data products; an increase in handset sales, including sales of higher-value smartphones through our expanding proprietary retail chain; and our ability to attract and retain higher-value subscribers.”

Mr. Alexey Kornya, MTS Vice President and Chief Financial Officer, said, “In 2012, Group adjusted OIBDA increased by 3% to $5.3 billion. Throughout the year we showed faster adjusted OIBDA growth relative to revenues due to rising contribution from data services and sustained focus on reducing costs. Group adjusted OIBDA margin came in above our guidance for 2012 at 42.6%, despite the suspension of our business in Uzbekistan, which had historically demonstrated a higher adjusted OIBDA margin than elsewhere. For the quarter, Group adjusted OIBDA increased by 1% year-over-year despite on-going costs in Uzbekistan and strategic decisions made by the company to increase our retail network. In Russia, OIBDA rose by 11% to RUB 148 billion. Sustained improvements in OIBDA throughout the year reflected on-going efforts by the Company to manage costs, while we realized benefits from decreased competitive activity.”

He continued, “CAPEX for the year came in line with our guidance at $2.9 billion or roughly 23% of sales. In 2012, we continued build-out of our 3G networks, which has reached 28,000 base stations with over 90% sites connected via IP-channels. We invested in backbone and backhaul roll-out in the regions as well as in our GPON project in Moscow, bringing the total length of our fiber-optic networks up to over 140,000 km.”

Mr. Dubovskov added, “With the near completion of our aggressive roll-out of 3G in 2012, we foresee a decrease in 3G-related CAPEX in 2013. However, we need to direct sufficient funds towards LTE network build-out to ensure we are able to offer our customers cutting edge solutions and seize commercial opportunities, which LTE provides. Overall, we expect to spend 20% of sales on capital investments.  For the period 2013 to 2015, we expect cumulative CAPEX/sales ratio in the range of 18-19%. We are confident that in 2013 we will be able to realize our goal of 5 to 7% revenue growth in local currencies. We believe that macroeconomic factors, the changing revenue mix within the Group and improvement in the competitive environment will allow us to sustain our OIBDA margin in the range of 41 to 42% for 2013.”

This press release provides a summary of some of the key financial and operating indicators for the period ended December 31, 2012. For full disclosure materials, please visit http://www.mtsgsm.com/resources/reports/.

Financial Summary

Russia Highlights

Ukraine Highlights

(4) Revenue, net of intercompany between mobile and fixed.

Armenia Highlights

Turkmenistan Highlights

CAPEX Highlights

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For further information, please contact in Moscow:

Joshua B. Tulgan

Director, Corporate Finance & Investor Relations

Mobile TeleSystems OJSC

Tel: +7 495 223 2025

E-mail: ir@mts.ru

Learn more about MTS. Visit the official blog of the Investor Relations Department at www.mtsgsm.com/blog/ and follow us on Twitter: JoshatMTS

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Mobile TeleSystems OJSC (“MTS”) is the leading telecommunications group in Russia and the CIS, 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 nearly 100 million mobile subscribers. The Group has been awarded GSM licenses in Russia, Ukraine, Turkmenistan, Armenia and Belarus, a region that boasts a total population of more than 200 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.

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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 undertake or 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, the severity and duration of current economic and financial conditions, including volatility in interest and exchange rates, commodity and equity prices and the value of financial assets; the impact of Russian, U.S. and other foreign government programs to restore liquidity and stimulate national and global economies, our ability to maintain our current credit rating and the impact on our funding costs and competitive position if we do not do so, strategic actions, including acquisitions and dispositions and our success in integrating acquired businesses, 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, governmental regulation of the telecommunications industries and other risks associated with operating in Russia and the CIS, volatility of stock price, financial risk management and future growth subject to risks.

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Attachments to the Fourth Quarter and Full Year 2012
Earnings Press Release

Attachment A

Non-GAAP financial measures. This press release includes financial information prepared in accordance with accounting principles generally accepted in the United States of America, or US GAAP, as well as other financial measures referred to as non-GAAP. The non-GAAP financial measures should be considered in addition to, but not as a substitute for, the information prepared in accordance with US GAAP. Due to the rounding and translation practices, US dollar and functional currency margins, as well as other non-GAAP financial measures, may differ.

Operating Income Before Depreciation and Amortization (OIBDA), OIBDA margin, adjusted OIBDA and adjusted OIBDA margin. OIBDA represents operating income before depreciation and amortization. Adjusted OIBDA represents OIBDA adjusted for the impairment and provision for claims in Uzbekistan. OIBDA margin and adjusted OIBDA margin are defined as OIBDA and adjusted OIBDA as a percentage of our net revenues. OIBDA and adjusted OIBDA may not be similar to OIBDA measures of other companies, are not measurements under accounting principles generally accepted in the United States and should be considered in addition to, but not as a substitute for, the information contained in our consolidated statement of operations. We believe that OIBDA and adjusted OIBDA provide useful information to investors because they are indicators of the strength and performance of our ongoing business operations, including our ability to fund discretionary spending such as capital expenditures, acquisitions of mobile operators and other investments and our ability to incur and service debt. While depreciation and amortization are considered operating costs under generally accepted accounting principles, these expenses primarily represent the non-cash current period allocation of costs associated with long-lived assets acquired or constructed in prior periods. The impairment and provision for claims in Uzbekistan are also operating costs under generally accepted accounting principles and represent material and unusual changes occurred in Uzbekistan in the current year. Our OIBDA and adjusted OIBDA calculation is commonly used as one of the bases for investors, analysts and credit rating agencies to evaluate and compare the periodic and future operating performance and value of companies within the wireless telecommunications industry. OIBDA and adjusted OIBDA can be reconciled to our consolidated statements of operations as follows:

OIBDA margin and adjusted OIBDA margin can be reconciled to our operating margin as follows:

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Attachment B

Net debt represents total debt less cash and cash equivalents and short-term investments. Our net debt calculation is commonly used as one of the bases for investors, analysts and credit rating agencies to evaluate and compare our periodic and future liquidity within the wireless telecommunications industry. The non-GAAP financial measures should be considered in addition to, but not as a substitute for, the information prepared in accordance with US GAAP.

Net debt can be reconciled to our consolidated balance sheets as follows:

Free cash-flow can be reconciled to our consolidated statements of cash flow as follows:

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Attachment C

Definitions

Subscriber. We define a “subscriber” as an individual or organization whose account shows chargeable activity within sixty one days in the case of post-paid tariffs, or one hundred and eighty three days in the case of our pre-paid tariffs, or whose account does not have a negative balance for more than this period.

Average monthly service revenue per subscriber (ARPU). We calculate our ARPU by dividing our service revenues for a given period, including interconnect, guest roaming fees and connection fees, by the average number of our subscribers during that period and dividing by the number of months in that period.

Average monthly minutes of usage per subscriber (MOU). MOU is calculated by dividing the total number of minutes of usage during a given period by the average number of our subscribers during the period and dividing by the number of months in that period.

Churn. We define our “churn” as the total number of subscribers who cease to be a subscriber as defined above during the period (whether involuntarily due to non-payment or voluntarily, at such subscriber’s request), expressed as a percentage of the average number of our subscribers during that period.

Subscriber acquisition cost (SAC). We define SAC as total sales and marketing expenses and handset subsidies for a given period. Sales and marketing expenses include advertising expenses and commissions to dealers. SAC per gross additional subscriber is calculated by dividing SAC during a given period by the total number of gross subscribers added by us during the period.

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MOBILE TELESYSTEMS

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME

FOR THE THREE MONTHS (UNAUDITED) AND TWELVE MONTHS ENDED DECEMBER 31, 2012 AND 2011

(Amounts in thousands of US Dollars except per share amount)