Moscow, Russia – April 29, 2009 – “COMSTAR – United TeleSystems” JSC (“Comstar” or “the Group”) (LSE: CMST), the largest integrated telecommunications provider in Moscow and 69 Russian cities, today announced that the test phase of its mobile WiMAX network project has been completed, and the network will be fully launched from May 1, 2009.

The discounted tariff plan for internet access with the data transmission volume of 2 Gigabits will be offered for WiMAX test participants for a subscription fee of RUR 200.00 (US$ 6.0 ) per month. The charge for the data transmission volume which exceeds a prepaid level will be RUR 1.00 (US$ 0.03) per additional Megabite. New subscribers will be offered WiMAX services and equipment from the middle of May 2009.

Sergey Pridantsev, President and Chief Executive Officer of Comstar UTS, commented: “We are ready to fully launch mobile WiMAX services for our subscribers in Moscow in May this year. The new services will be offered within the frame of the unified telecommunications space created by Comstar. We are very grateful to all our subscribers who have participated in the test phase of the project which was launched on January 15, 2009. Their feedback and recommendations assist us in creating the network which will enable us to provide highly efficient services.”