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A satellite phone or satphone is a mobile phone that sends and receives calls with the use of satellites rather than telephones or cellular broadcasting towers. A sat phones only requires a clear line of sight to the sky. The advantage of a sat handset is that it can complete calls from everywhere. A satellite phone can operate in the middle of the Sahara desert, at the top of Mount Everest, or from a clearing deep within a South African jungle. It is an indispensable tool for remote ventures of all kinds, and provides good communication on the seas and in the air.

A disadvantage of a satellite phone is a noticeable delay in conversations. The signal must first travel to the satellite, then to an earthbound gateway before go to the receiver. The recipient's response will follow the same path in reverse, taking equally long to reach the caller. Satellite minutes are also more expensive than cellphone minutes.

However, these problems are irrelevant when considering the function that a satellite phone serves. It can create a link to civilization from places where no other link is available. It also lets loved ones to stay in touch, like the researchers, adventurers and those in the military, and it can provide backup communication in disasters if ever cellular sites or landlines might not be functional.

The three main satellite networks at present are Iridium, Globalstar and Thuraya. Iridium uses low orbiting satellites that minimize communications delays, but more importantly, it is the only present satellite network that offers coverage over the entire earth, including the oceans. Competitor Globalstar covers about 80% of the earth's landmasses, excluding northern and southern polar earth regions, while Thuraya covers parts of India, Asia, Africa, the entire Middle East and Europe.

In favor of those who only wish to use a satellite phone on rare occasions, one can rent rather than buy . Hiring fees start at almost US$40 per week, but this does not include talk time, which can run as high as $1.75 per minute. If buying a satellite phone outright, an agreement is necessary with a satellite network, or pre-paid cards may be purchased. Minutes are less expensive with a contract than when renting or buying prepaid, but are still expensive than cellular minutes.

Satellite phones range charges according to network coverage places. Iridium phones are more expensive because they can make calls from anywhere in the world. One newest entry-level Iridium satellite phone sells for US$1,275, while other communication phones start out at about half that price, and can be found for less. Because sat-phones are so expensive, they are often purchased used.

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