Hello! United Satcom is happy to answer your question: In short, the difference is that different operators have the same satellite operators, but three are different from China Unicom, China Mobile and China Telecom, that is, three different satellite network companies. Technology: Iridium has 66 satellites, covering the whole world, including the north and south poles of the earth. Inmarsat and Eusat are geostationary satellites, and the second-pass series are synchronous satellites, which are located above the equator. In terms of signal, because Inmarsat and Eusat are geostationary satellites, the advantage is that as long as the satellite phone has a signal, there will always be a signal, because the satellite is stationary relative to the earth, just like Inmarsat phone has no signal now, and there will never be a signal. United Satcom is different from Iridium. Iridium is a mobile satellite. In principle, 2-3 satellites can be used at the same time in an open place. However, because it is a low-orbit satellite, the satellite is easily blocked by buildings. However, in some cases, there is no signal as soon as the satellite turns. Even if there is a signal, switching satellites in the same place may be "disconnected". The purpose and the three satellites have their own advantages and disadvantages.

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