Iridium is perhaps the most popular, or rather notorious, of the satellite systems on the market. They very publicly went bankrupt in 1999; one year after the service was launched. But nevertheless, Motorola Inc. stepped in and settled their liabilities. Iridium was re-launched in 2001 and has been operating ever since.
Iridium's aim was to create a satellite service that would offer truly global reception, a service that Inmarsat and Globalstar have not yet realized. To achieve this the Iridium network uses 66 satellites, 450 miles high, orbiting the globe on 6 different planes. Traveling at 16,832 miles per hour, every satellite is able to circle the globe every 100 minutes.
This layout assures that an Iridium handset will be able to send and receive calls from any location on the planet (the only restrictions to this countries who have declined to back-up the service for political reasons). So long as the phone has a clear line of site to the sky it will continue to keep communication with at least two satellites at any one time.
The major criticism that has been leveled at Iridium is the fact that they are limited in their data and fax capabilities. The service is available but not to the standards that Inmarsat and Globalstar can offer.
Additionally, as discussed briefly in regards to Inmarsat's service, Iridium run a higher risk of loosing a coverage once it has been sent. This occurs since they depend on the passing of receptions via a number of satellites before routing them to their final destinations.
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