If you want to make a phone call from the North Pole, you want Iridium Communications (formerly Iridium Satellite). The company offers mobile voice, data, and Internet services worldwide, targeting companies that operate in remote areas. While Iridium focuses on such commercial industries as energy, defense, maritime, and mining, its main customer is the US Department of Defense. Boeing primarily operates and maintains the Iridium satellite system, which consists of 66 low-earth-orbit satellites linked to ground stations (the world's largest commercial satellite operation). The company has operations centers in Arizona and Virginia.