Inmarsat vs. Iridium | What's the difference? The truly global Iridium network offers satellite phones, PTT radio solutions, and WiFi hotspots to keep users connected from any location on earth. The Iridium Extreme® satellite phone, for example, is one of the most powerful satellite phones on the market today, and comes with built-in GPS and SOS capabilities. Visit us- https://gtc.co.uk/blogs/all/inmarsat-vs-iridium-whats-the-difference