A satellite telephone, satellite mobile, or satphone is a cell phone that connects direct with orbiting communications satellites. Relying on the architecture of a particular system, coverage may include the rest of the Earth, or merely precise areas.

The mobile phone device, also referred to as a terminal or earth station, varies widely. A satellite phone handset has a size and weight identical to that of a late nineteen eighties or early on 1990s mobile, but typically having a large retractable antenna. These are popular on expeditions into isolated areas where terrestrial mobile service is out of reach.

A fixed set up, for instance used shipboard, normally include large, durable, rack-mounted electronics, and a steerable microwave antenna on the mast that automatically tracks the overhead satellites. Sat phones have notoriously poor reception indoors, however it is possible to get a constant reception near a window or perhaps within the top floor of a building if the roof is sufficiently thin. The phones have connectors for external antennae that are often set up in vehicles and architecture.

Several satellite phones use satellites in geosynchronous orbit. These systems can easily maintain near-continuous global signal having only three or four satellites, reducing the launch fees.

The concerns of geostationary satellite systems is that many places perhaps even where a very clear view of the sky is present the line of sight among the phone and the satellite is broken by barriers such as steep mountain hills and jungle and the consumer needs to find higher surfaces before having the capacity to use the phone. This is not the case with Low Earth Orbit (LEO) services - even though the signal is stuck by an obstacle anyone can wait a few minutes till another satellite transmits overhead.

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