A satellite phone or satphone is a handset waiting for incoming and outgoing calls with the use of satellites rather than landlines or cell phone broadcasting towers. A satellite phones only requires a clear vision of the sky. The benefit of a satellite mobile phone is that it can complete calls from anywhere. A satellite phone can work 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 ncesarry tool for isolated expiditions of all kinds, and provides solid broadcasting on the seas and in the air.

A disadvantage of a satellite phone is a noticeable delay in conversations. The signal must first pass through to the satellite, next, back to an earthbound gateway before go to the receiver. The receiver's answer will follow the same path in reverse, taking equally long to reach the caller. Satellite minutes are also more high-priced rather than cell phone minutes.

However, these drawbacks are extraneous when considering the function that a satellite phone serves. It can create a link to people from locations where no other link is available. It also permits loved ones to stay in touch, as in the case of researchers, excursionists and those in the military, and it can provide backup connectivity in adversities if ever cellular towers or telephones might not be functional.

The three main satellite networks at present are Iridium, Globalstar and Thuraya. Iridium makes use of low orbiting satellites that lessen communications delays, but more importantly, it is the only current satellite reception that provides reception in the entire world. Rival Globalstar covers about 80% of the earth's landmasses, not including the northern and southern polar earth regions, while Thuraya covers parts of India, Asia, Africa, the entire Middle East and Europe.

For those who only need to use a satellite phone on rare occasions, one can hire instead of purchasing. Hiring fees start at about US$40 a week, but this does not include talk time, which can cost as high as $1.75 per minute. If purchasing a satellite phone outright, an agreement is necessary with a satellite network, or prepaid cards may be bought. Minutes are less expensive with a contract than when renting or purchasing prepaid, yet are still expensive than cellular minutes.

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

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