A satellite phone is really a type of cellular telephone that, in contrast to conventional mobile phones, offers services essentially anywhere. Even though frequently much more expensive than mobile phones, they offer the critical ability of making telephone calls from anywhere at any time, independent of nearby cell assistance.

Identification

1. A satellite phone works by connecting to an orbiting satellite television to obtain communication services. This is different from a mobile telephone, which connects to a local, land-based services tower. Though mobile networks use satellites to attain larger communications networks, cell mobile phones do not directly dials these satellites. Satellite mobile phones do.

Characteristics

2. Some satellite phone systems use a network of satellites in geosynchronous orbit, which allows the network to accomplish global coverage with only 3 or four satellites. ACeS, Inmarsat, MSAT, and Thuraya all do this, though some services providers such as ACeS use fewer satellites to attain strictly regional, rather than global coverage. Another method would be to location satellites in low-Earth orbit. This demands far much more satellites---several dozen to attain global coverage---but they can be smaller, reduces launch costs. Globalstar and Iridium are each examples of low-Earth orbit satellite mobile phone systems.

Effects

3. The microwave transceivers of satellite phones get notoriously poor assistance indoors, and in this respect their reliability is dramatically worse than cell mobile phones. Also, systems that depend on geosynchronous satellites have a noticeable transmission delay of much more than a second, since the satellites sit at about 22,000 miles in space, meaning each signal must travel roughly 44,000 miles from one mobile phone to an additional. These mobile phones are also more costly than cell mobile phones: both the actual handset and also the service time are substantially a lot more pricey than their mobile phone counterpart. Calling a satellite telephone from a land line or mobile telephone is extremely expensive, though this charges the proprietor of the satellite telephone nothing. Nonetheless, if you wish to have reliable communications in remote places or bypass possible communications interference from nearby governments, a satellite phone is the way to go.

Considerations

4. Satellite phones are normally assigned their own unique nation codes. Inmarsat mobile phones, for example, are usually assigned country codes between 870 and 874, whilst Iridium uses 881 6 and 881 7.

Background

5. The very first satellite cell phone firm began as the International Cell Satellite Group in 1979, a non-profit worldwide organization began through the UN. It was produced to provide dependable communications for the maritime community. The institution was called "Inmarsat" through the very starting, and became a private, for-profit firm in 1999.

Warning

6. More problem with satellite phones is that their networks usually operate near or at their capability even below regular conditions. There is not lots of extra capacity within the network. This indicates that a spike in call volume, as has happened in the course of situations of major, regional emergencies for example the 9/11 attack, the 2003 Northeast Blackout, or the 2004 Indian Ocean Tsunami, can cause the satellite network to collapse.

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