Satellite television provides the bulk of EchoStar’s revenue. The firm serves about 6 million US customers, about 10% of the traditional television market. It launched an internet-based television offering under the Sling brand in 2015 and serves about 2 million customers on this platform. The firm's focus is now on the wireless market. EchoStar has amassed an extensive portfolio of spectrum licenses and is building a nationwide wireless network. It acquired Sprint's prepaid business and serves about 7 million customers, primarily under the Boost brand. EchoStar’s legacy businesses provide satellite telecom services and equipment to businesses and consumers, including about 900,000 internet customers.