January 2012

31.01.2012
Ad Hoc Notice

Moscow, Russian Federation — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces that the Moscow Arbirazh Court will consider a bankruptcy claim against MTS filed by one of its former dealers, Lotsman Management Group LLC (“Lotsman”). The claim was filed on December 08, 2011, in connection with a commercial dispute in the amount of 17 million rubles relating to dealer commissions allegedly owed to Lotsman by MTS.

31.01.2012
MTS Completes Redemption of $400 million 2012 Eurobond

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces the redemption of its $400 million Eurobond which matured on January 28, 2012.

17.01.2012
MTS Launches First in Russia 3G Network in the 900 MHz Range

Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” or the “Company” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS, announces first in Russia commercial launch of the 3G network in the 900 MHz range in Moscow and the Moscow region. This will enable MTS to improve its 3G coverage and offer significantly faster speeds for subscribers.

Contact investor relations:

+ 7 495 223 20 25 ir@mts.ru

MTS Investor Relations
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