Iridium - a vision becomes reality

摘要

Analog or digital cellular systems in the 450, 800, 900 or 1800 MHz frequency ranges connect mobile telephone subscribers to each other or to subscribers in the worldwide public telephone network. These GSM-based networks also offer users fax and data services and many other attractive features. But the global mobile phone network Iridium goes one step further than existing terrestrial cellular systems. It will offer the features of GSM-based networks plus global accessibility under one number.