Iridium A fleet of 66 low-earth orbit (LEO) satellites provide military grade voice and data communications solutions with complete global coverage of the earth including polar regions.Iridium is the most reliable, and is the only network to cover all 7 continents.
The world’s leading mobile satellite operator. Its constellation of ten satellites located in geostationary orbit enables delivery of voice and high-speed data services and mobile IP broadband to almost anywhere on the planet. Inmarsat is a British company which offers excellent coverage along the worlds sea lanes.
Through its two geostationary satellites, Thuraya provides coverage of more than 140 countries in Europe and large parts of Africa and Asia for handheld voice and mobile IP broadband service. Thuraya is an innovative company based in the UAE and is a popular choice for Europe, Asia, Africa, and Australia. Sadly, coverage does not extend to the Americas.
Globalstar Globalstar offers service in the Americas, Europe and parts of Africa and Asia. While phones and airtime rates seems attractive, actual service seems sporadic.