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INMARSAT, is a worldwide telecommunications corporation established in 1979, primarily as an intergovernmental organisation. It performs a fleet of eleven(as of 2005) geosynchronous telecommunications satellites. The company is publicly traded on the London Stock Exchange (ISAT) as of June 2005.

INMARSAT offers telephony and information services to users world-wide, via special electronic radios known as "terminals". An INMARSAT terminal contacts the satellite and communicates to some ground station through the satellite. It supplies trustworthy communications providers to a selection of governments, aid agencies, media outlets and businesses needing to communicate in remote regions or wherever there is no reliable terrestrial network. Assistance becomes unavailable as you near the extreme north and south poles.

Providers include traditional voice calls, low-level data tracking systems, and high-speed data products and services. The most current of these provides GPRS-type companies at up to 144kbit/s via the BGAN IP satellite modem the size of your notebook computer. Other companies provide mobile ISDN services utilized through the media for live by way of videophone reporting on world events.

The telephone country codes for Inmarsat are:

# 871 Atlantic - East

# 872 Pacific

# 873 Indian Ocean

# 874 Atlantic - West

Historically pricey, calls via Inmarsat have now dropped to a degree wherever they're comparable and in several cases favourable, to global roaming costs, or hotel mobile phone calls.

Newer providers using IP engineering function an always-on capability where the user is merely charged with the amount of info they send and receive instead of the length of time they are on the net. Call charges are also the same where ever inside the globe the service is utilised. Older solutions utilised electronic speech coding and necessary a dedicated channel.

The satellites are digital transponders that obtain digital signals, reform the pulses, and then retransmit them to soil stations. The soil stations carry out billing and act as gateways for the public switched telephone network and world-wide-web.