The Iridium project was born in 1987, the name Iridium derives from the Iridium atom which has 77 electrons which rotate around the nucleus, in fact this constellation of satellites initially had to have 77 satellites; later, to reduce costs, the designers reduced the number of satellites to 66, but leaving the name unchanged. The Iridium satellite network is the first and still today the only truly wireless communication system global: there are no areas not reached by the satellite signal. Its network has high technical qualities, the direct switching achieved by satellites offers a good voice quality, comparable to terrestrial mobile communications. Communication costs and management, in general, of the service are very low and remain among the most competitive on the market satellite telecommunications. Using an Iridium phone is often cheaper. compared to GSM communications made in international roaming.