A satellite phone or satphone is a mobile phone waiting for incoming and outgoing calls with the use of satellites instead of landlines or cellular communication sites. A satellite phones only needs a clear line of sight to the sky. The benefit of a sat mobile phone is that it can totally complete calls from anywhere. A satellite phone can operate in the core of the Sahara desert, at the peak of Mount Everest, or from a clearing deep within a South African forest. It is an indispensable tool for isolated ventures of all kinds, and gives solid communication on the seas and in the air.

A weakness of a satellite phone is visible delay in conversations. The coverage must first travel to the satellite, go back to an earthbound gateway before go to the recipient. The receiver's response will will go to the same path in reverse, which takes time to reach the caller. Satellite minutes are also much more expensive rather than cellphone minutes.

Nevertheless, these drawbacks are irrelevant when you'll consider the features that a satellite phone serves. It can make a link to civilization from areas where no other link is available. It also lets loved ones to get in touch, as in the case of researchers, explorers and even those in the military service, and it can provide support communication in adversities if ever cellphone towers or landlines may not be working.

The three main satellite networks now are Iridium, Globalstar and Thuraya. Iridium uses low orbiting satellites that reduce communications delays, but the more important is, it is the only current sat coverage that gives signal worldwide. 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.

For those who only desire to make use of a satellite phone on unusual occasions, you can rent instead of purchasing. Hiring charges start at about US$40 per weekly, but this doesn't include talk time, which may run as high as $1.75 per minute. If purchasing a satellite phone outright, an agreement is important with a satellite network, or prepaid cards may be purchased. Minutes are inexpensive with an agreement than when hiring or buying prepaid, yet are still expensive than cellphone minutes.

Satellite phones range in price according to reception locations. Iridium mobile phones are more expensive simply because they can make calls from anywhere in the world. Another newest entry-level Iridium sat mobile phone sells for US$1,275, while other network phones range from half that price, and can be found for a lesser price. Because satellite phones are so expensive, they are often purchased used.

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