The Iridium system is based on 66 LEO satellites offering global coverage, even including the Polar Regions: it repre- sents the world's largest constellation of telecommunications satellites for private use.
The "Iridium" project was announced by Motorola in 1990 with simultaneous press conferences being held in Beijing, London, Melbourne and New York. The name was inspired by Iridium, the element identified by the number 77 on the periodic table: in fact, the initial project involved the launch of 77 satellites. On 1 November 1998, with its 66 satellites, the Iridium network was completed and the service was rendered operational.
The operator Iridium Communications Inc., is a publicly traded company based in Maryland, USA.
Iridium is the only telephony system that's capable of offering both voice and data communications to and from any point on Earth, including the Poles. The constellation's network architecture offers good voice quality and exceptional reliabil- ity of service, to the point that it is comparable to a terrestrial mobile communication system.
Satellite services must be used complying with local regulations on use of satellite telephone devices..
* Iridium offers global coverage, including the oceans and poles.