ZOLEO was the first satellite communicator to offer truly seamless global messaging coverage across satellite, cellular and Wi-Fi networks. The beauty of using ZOLEO is that it takes advantage of the lowest-cost network, transmitting via cellular and Wi-Fi when it is available, and over the Iridium®satellite network when it isn’t. You enjoy a truly seamless global messaging experience that isn’t offered by some other satellite-based communicators. Iridium Offers Coverage Where Cellular Doesn’t ZOLEO devices operate on the world’s largest and most advanced commercial satellite constellation, Iridium. Only Iridium offers coverage everywhere on the planet, including Earth's landmasses, oceans, skies and Polar Regions. With Iridium there are absolutely no coverage gaps.