A satellite phone or satphone is a mobile phone that sends and receives calls with the use of satellites instead of telephones or cellular broadcasting towers. A satellite mobile phones only needs a clear line of sight to the sky. The advantage of a sat handset is that it can totally 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 forest. It is an indispensable tool for far ventures of all kinds, and gives good communication on the seas and in the air.
A disadvantage of a satellite phone is a noticeable delay in conversations. The reception must first travel to the satellite, then to an earthbound gateway before go to the recipient. The recipient's response will follow the same path in reverse, taking equally long to reach the caller. Satellite minutes are also much more expensive than cellphone minutes.
Though, these problems are irrelevant when considering the function that a satellite phone provides. It can provide a link to civilization from places where no other link is available. It also lets loved ones to get in touch, like the researchers, adventurers and those in the military, and it can provide support communication in disasters if ever cellphone sites or landlines might not be functional.
The three major satellite networks currently are Iridium, Globalstar and Thuraya. Iridium uses low orbiting satellites that minimize communications delays, but the more important is, it is the only latest satellite network that provides coverage globally. Competitor Globalstar covers about 80% of the earth's landmasses, excluding northern and southern polar earth regions, while Thuraya covers some 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, you can rent rather than buy . Hiring charges start at almost US$40 per week, but this does not include talk time, which may run as high as $1.75 per minute. If buying a satellite phone outright, an agreement is important with a satellite network, or pre-paid cards may be purchased. Minutes are less expensive with a contract than when hiring or buying prepaid, but are still expensive than cellphone minutes.
Satellite phones range costs according to network coverage areas. Iridium phones are more costly simply because they can make calls from anywhere in the world. One newest entry-level Iridium satellite handset sells for US$1,275, while other communication phones start out at about half that price, and can be found for less. Because satellite mobile phones are so expensive, they are often purchased used.
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