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Iridium effects communication via satellite, so it can be used even in places where no other methods of communication are available. The phones are light and portable.
During emergencies, both fixed and mobile phone use faces limitations, and may become useless. These limitations do not affect the Iridium phone because they make use of satellites.
Obstacles interrupt the signals for Iridium phones, so it is often not possible to use them indoors, but this weakness is overcome by installing fixed outdoor antennas.
See the following URL for more details about the outdoor antenna.