Moscow, Russian Federation – Mobile TeleSystems OJSC (“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, issued a release informing that it has completed the share buyback related to the statutory merger of Comstar into Mobile TeleSystems OJSC (“MTS” – NYSE: MBT), the leading telecommunications provider in Russia and the CIS.

For additional information, please visit Comstar’s corporate website at: https://comstar.ru/en/news_center/pressreleases/.