OREANDA-NEWS. May 15, 2012. The management of Mobile TeleSystems (MTS) will be holding a conference call to discuss the Company’s First Quarter 2012 Financial and Operating Results on Monday, May 21, 2012.

Please note that the conference call will start at:

18:00 hrs (Moscow time)

15:00 hrs (London time)

10:00 hrs (US Eastern time)

To take part in the conference call, please dial one of the following telephone numbers, quoting the Company’s name, MTS, or the conference ID, 4539577:

From the US:      + 1 480 629 9799

From the UK:      + 44 20 7190 1598

International:      + 44 207 190 1598

The conference call will also be available at: http://www.mtsgsm.com/news/reports/ via audio webcast.

The earnings release and the management’s slide presentation will be posted approximately three hours prior to the conference call at: http://www.mtsgsm.com/news/reports/.

A replay of the conference call will be available on the following telephone numbers from May 21, 2012 (from approximately 23:00 hrs Moscow time/20:00 hrs London time/15:00 hrs US Eastern time) to May 28, 2012:

From the US:    + 1 303 590 3030      PIN 4539577#

From the UK:    + 44 20 7190 1598   PIN 4539577#

International:     + 44 20 7190 1598    PIN 4539577 #.