I guess this explains the moving target.
You need LEO because you may not always be able to get a clear shot at a sat.
The list of places you CAN'T have one was intresting
Satellite phone network
Geosynchronous satellites
Some satellite phones use satellites in geostationary orbit, which are meant to remain in a fixed position in the sky. These systems can maintain near-continuous global coverage with only three or four satellites, reducing the launch costs. The satellites used for these systems are very heavy (approx. 5000 kg) and expensive to build and launch. The satellites sit at an altitude of about 22,000 miles (35,000 km); a noticeable delay is present while making a phone call or using data services due to the large distance from users. The amount of bandwidth available on these systems is substantially higher than that of the Low Earth Orbit (LEO) systems; all three active systems provide portable satellite Internet using laptop-sized terminals with speeds ranging from 60 to 512 kbits per second (kbps).
Another disadvantage of geostationary satellite systems is that in many areas—even where a large amount of open sky is present—the line-of-sight between the phone and the satellite is broken by obstacles such as steep hills and forest. The user will need to find an area with line-of-sight before using the phone. This is not the case with LEO services: even if the signal is blocked by an obstacle, one can wait a few minutes until another satellite passes overhead, but a moving LEO may drop a call when line of sight is lost.
* ACeS: This small regional operator provides voice and data services in East Asia using a single satellite.
* Inmarsat: The oldest satellite phone operator, founded in 1979. It originally provided large fixed installations for ships, but has recently entered the market of hand-held phones in a joint venture with ACeS. The company operates eleven satellites, with another planned for launch in 2010. Coverage is available on most of the Earth, except polar regions.
* Thuraya: A system based in the UAE. Three satellites are currently in service that provide coverage to the most of Eurasia, Africa and Australia. There is some degree of coverage overlap between adjacent satellites within the network.
* MSAT / SkyTerra: An American satellite phone company that uses equipment similar to Inmarsat, but plans to launch a service using hand-held devices in the Americas similar to Thuraya's.
* Terrestar: Satellite phone system for North America
* ICO Global Communications: A satellite phone company which has launched a single geosynchronous satellite which is not yet active.
[edit] Low Earth orbit
LEO telephones utilizes LEO (low Earth orbit) satellite technology. The advantages include providing worldwide wireless coverage with no gaps. LEO satellites orbit the earth in high speed, low altitude orbits with an orbital time of 70–100 minutes, an altitude of 640 to 1120 kilometers (400 to 700 miles), and provide coverage cells of about (at a 100-minute orbital period) 2800 km in radius (about 1740 mi). Since the satellites are not geosynchronous, they must fly complete orbits. At least one satellite must have line-of-sight to every coverage area at all times to guarantee coverage. Depending on the positions of both the satellite and terminal, a usable pass of an individual LEO satellite will typically last 4–15 minutes on average;[3] thus, a constellation of satellites is required to maintain coverage (as is done with Iridium, Globalstar, GPS, and others).
Two such systems, both based in the United States started in the late 1990s but soon went into bankruptcy after failing to gain enough subscribers to fund launch costs. They are now operated by new owners who bought the assets for a fraction of their original cost, and are now both planning to launch replacement constellations supporting higher bandwidth. Data speeds for current networks are between 2200 bit/s and 9600 bit/s using a satellite handset.
* Globalstar: A network covering most of the world's landmass using 44 active satellites; however many areas are left without coverage since a satellite must be in range of an earth station. Satellites fly in an inclined orbit of 52 degrees, so polar regions cannot be covered. The network went into limited commercial service at the end of 1999 .
* Iridium: A network operating 66 satellites in a polar orbit that claims coverage everywhere on Earth. Commercial service started in November 1998 and fell into bankruptcy soon after. In 2001, service was re-established by a new company. Radio cross-links are used between satellites to relay data to the nearest satellite with a connection to an earth station.
[edit] Tracking
LEO systems have the ability to track a mobile unit's location using doppler shift calculations from the satellite.[4] However, this method can be inaccurate by tens of kilometers. On some Iridium hardware the coordinates can be extracted using AT commands, while recent Globalstar handsets will display them on the screen.[5]
[edit] Locations banning satellite phones
In some countries possession of a satellite phone is illegal.[6] Their signals will usually bypass local telecoms systems, hindering censorship and wiretapping attempts. These countries tend to score low on the Democracy index, with the exception of India, so a ban can be the result of the state's desire for mass surveillance or that it lacks the technology to intercept satellite phone traffic.
* North Korea
* India - Proper permission required [7][8][9]
* Cuba[citation needed]
* Libya[citation needed]
* Burma [10]
Satellite phones are legal in most countries and are not disfavoured by many governments. In Australia, residents of remote areas may apply for a government subsidy for a satellite phone.[11]
http://en.wikipedia.org/wiki/Satellite_phone