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

A weakness of a satellite phone is visible delay in communications. The network must first travel to the satellite, then to an earthbound gateway before being routed to the receiver. The recipient's response will will go to the same path in reverse, which takes time to get to the caller. Satellite minutes are also more expensive than cellular minutes.

However, these problems are irrelevant when you'll consider the features that a satellite phone provides. It can create a link to civilization from places where no other link is available. It also allows loved ones to stay in touch, like the researchers, adventurers and even those in the military service, and provide backup communication in disasters when cellular sites or landlines may not be working.

The three major satellite networks at present are Iridium, Globalstar and Thuraya. Iridium uses low orbiting satellites that minimize conversational delays, but more importantly, it is the only latest satellite network that gives signal in the entire world. Competitor Globalstar covers about 80% of the earth's landmasses, excluding northern and southern polar regions, while Thuraya covers parts of India, Asia, Africa, the entire Middle East and Europe.

In favor of those who only desire to make use of a satellite phone on atypical time, one can rent rather than buy . Rental fees start at almost US$40 per weekly, but this doesn't include talking time, which can run as high as $1.75 per minute. If buying a satellite phone outright, a contract is necessary with a satellite network, or pre-paid cards may be purchased. Minutes are inexpensive with an agreement rather when renting or buying prepaid, but are still more expensive than cellular minutes.

Satellite phones range costs according to network coverage locations. Iridium mobile phones are more costly because they can make calls from anywhere in the world. One current entry-level Iridium sat phone sells for US$1,275, while other communication phones range from half that price, and can be found for a lesser price. Generally, because sat phones are so expensive, they are often purchased used.

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