Cellco Partnership, doing business as Verizon Wireless, owns and operates the second largest wireless telecommunications network in the United States, based on total wireless customers. Based on revenue, Verizon Wireless is the largest American wireless company and largest wireless data provider. As of the year ending 2007, the company served a total of 65.7 million U.S. subscribers and had an annual revenue of $43.9 billion. Headquartered in Basking Ridge, New Jersey, the company is a joint venture of Verizon Communications and Vodafone Group, with 55 and 45 percent ownership respectively.