Moscow, Russian Federation – Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the largest mobile phone operator in Russia and the CIS, affirms statements made by Mikhail Shamolin, President and CEO of the Company.

MTS confirms that Mikhail Shamolin, President and CEO of the Company, commented to both the media and to investors on its Q1 2009 financial and operating results conference call that MTS anticipates single-digit year-over-year ruble revenue growth in its Russian business unit in 2009 and a single-digit year-over-year revenue reduction in hryvna revenue in Ukraine in 2009, provided the macroeconomic environment remains stable relative to the current period.