Satellite television provides the bulk of EchoStar's revenue. The firm serves about 5 million US satellite customers, about 10% of the traditional television market. It also serves 2 million customers under the Sling brand. EchoStar has also amassed an extensive portfolio of spectrum licenses and is building a nationwide wireless network. It acquired Sprint's prepaid business, serving approximately 7 million customers, primarily under the Boost brand. The firm has agreed to sell a portion of its wireless licenses to AT&T and SpaceX, and will rely heavily on the AT&T network to serve customers. EchoStar's legacy businesses provide satellite telecom services and equipment to businesses and consumers, including about 800,000 internet customers.