LEO satellites spin in the lower orbit of earth that is approximately 1500 kilometers. These systems are operated by companies like GLOBALSTAR and IRIDIUM. When we are going to compare the GEO synchronous and LEO system then we can say that the first one gorilla of the industry and the second one is the mosquito.
Because LEOs are so low in their orbits, a network might require as many as 60 to 66 satellites to provide coverage for most of the world. At any one time, a user may be within the range of two or more LEO satellites. These satellites complete the entire orbit in around two hours.
Fast-moving satellites in LEO orbit mean reliable service for much of the planet. So, if you are in an emergency then you can rely on LEO satellites for communications.
LEO satellite phones are known for superior call quality, lower transit time, and greater dependability. They also need less power as compare to GEO satellite phones.
Data transmission and reception rate are low as compare to GEO synchronous system.
Whether you are using a GEO synchronous or LEO system, for best service, your satellite phone needs a line of sight view to the satellites. As of result, you need to step outside to make a call.