Mobile Telesystems is a provider of mobile cellular communications services in the Russian Federation, Ukraine, Uzbekistan and Turkmenistan to consumers and corporate customers, employing technology based primarily on Global System for Mobile Communications (GSM). Co. had a mobile subscriber base of around 102.5 million (77.3 million in Russia, 20.4 million in Ukraine, 2.1 million in Turkmenistan, 1.6 million in Uzbekistan and 1.1 million in Armenia). In addition to standard voice services, Co. provides improved services, including voice mail, short message service, general packet radio service, and various SMS- and GPRS-based information and entertainment services.

Rostelecom PJSC provides communication services (including local, intra-zone, long-distance domestic and international fixed-line telephone services, mobile services), data transmission, Internet, Pay TV, VPN and data centers services, rent of communication channels and radio communication services in the territory of Russian Federation. Co. operates the main intercity network and the international telecommunications gateways of the Russian Federation, carrying voice and data traffic that originates in its own network and other national and international operators' networks to other national and international operators for termination.