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Globalstar Telecommunications has launched four more satellites for its planned satellite-based phone, fax, paging, and data service. Globalstar expects to begin offering its service, which will be similar to Iridium's satellite phone offering, in September. Some analysts expect Globalstar service and equipment to cost about one-third less than Iridium's. Globalstar has successfully launched 24 low-Earth orbiting satellites. The system is expected to consist of more than 50 satellites when finished, according to analysts.