The Bulgarian Telecommunications Co, which last week gave contracts to Siemens AG, L M Ericsson Telefon AB, Alcatel NV and Northern Telecom Ltd under its $300m modernisation programme, says it will announce two more foreign investors shortly: We will announce soon our partners for building up a surface satellite station and for introduction of a new digital overlay network, Antoni Slavinski, deputy chairman told Reuter; and a joint venture between Bulgarian Telecommunications Co and US Sprint International Inc will start operating on April 15; Sprint Business Telecommunications Co will enable customers in Bulgaria to link host and personal computers with others around the world, and says it already has some 50 applications, mostly from foreign companies operating in Bulgaria.