The satellites sit at an altitude of 35,786 kilometres (22,236 mi) a noticeable delay is present while making a phone call or using data services due to the large distance from users. The satellites used for these systems are very heavy (about 5000 kg) and expensive to build and launch. These systems can maintain near-continuous global coverage with only three or four satellites, reducing the launch costs. Contents.Satellite phone network Geostationary satellites Some satellite phones use satellites in, which appear at a fixed position in the sky. The systems also allow for the use of repeaters, much like terrestrial mobile phone systems. The phones have connectors for external antennas that can be installed in vehicles and buildings. Service satellite phones have notoriously poor reception indoors, though it may be possible to get a consistent signal near a window or in the top floor of a building if the roof is sufficiently thin. Smaller installations using over a two-way service such as or bring the costs within the reach of leisure vessel owners. Satphones are popular on expeditions into remote areas where terrestrial cellular service is unavailable.A fixed installation, such as one used aboard a ship, may include large, rugged, rack-mounted electronics, and a steerable antenna on the mast that automatically tracks the overhead satellites.
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