A satellite phone or satphone is a mobile phone waiting for incoming and outgoing calls with the use of satellites instead of telephones or cellular broadcasting signals. A satellite phones only requires a clear line of sight to the sky. The benefit of a satellite mobile phone 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 jungle. It is an essential tool for far away expiditions 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 signal must first travel to the satellite, next, back 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 more expensive rather than cell phone minutes.
Though, these problems are irrelevant when considering the function that a satellite phone serves. It can create a link to civilization from locations where no other link is available. It also permits loved ones to get in touch, like the researchers, adventurers and those in the military, and it can provide backup communication in adversities if ever cellphone 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 lessen communications delays, but the more important is, it is the only present satellite network that provides reception in the entire world. Competitor Globalstar covers about 80% of the earth's landmasses, not including the 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 atypical occasions, one can rent instead of purchasing. Hiring charges 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 purchasing 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 renting or buying prepaid, yet are still expensive than cellphone minutes.
Satellite phones range charges according to network coverage areas. Iridium phones are more expensive because they can make calls from anywhere in the world. Another 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 sat-phones are so expensive, they are often purchased used.
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