A satellite telephone, satellite mobile, or satphone is a mobile phone that connects directly with orbiting communications satellites. Based on the building of a particular system, reception may include the entire Earth, or merely specific portions.
The mobile equipment, well-known as a terminal or earth station, ranges widely. A satellite phone handset has a size and weight comparable to that of a late nineteen eighties or early 1990s mobile, but usually with a large retractable antenna. These are well-known on adventures into distant areas where terrestrial cellular service is inaccessible.
A fixed installation, for instance used shipboard, may include large, rugged, rack-mounted electronics, and also a steerable microwave antenna on the mast that automatically tracks the overhead satellites. Satellite handsets have notoriously poor reception indoors, though it is possible to get a consistent network near a window or in the top floor of a construction if the roof is sufficiently thin. The mobiles have connectors for external antennae that are often installed in vehicles and infrastructures.
Some satellite phones use satellites in geosynchronous orbit. These systems can retain near-continuous global coverage with only 3 or four satellites, lessening the launch costs.
The concerns of geostationary satellite systems is that many areas perhaps even where a large amount of open sky is present the line of sight between the mobile and the satellite is broken by obstructions such as steep hills and jungle and the user need to find higher ground before being able to use the mobile phone. This is not the case with Low Earth Orbit (LEO) services - despite that the signal is blocked by an obstacle anyone can wait a few minutes until another satellite transmits overhead.
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