At Crown Castle USA, our core business involves the engineering, deployment, marketing, ownership, operation and leasing of shared wireless communications sites. Nearly every major wireless carrier is a tenant on sites that are owned or managed by Crown Castle. Our tenants include Verizon Wireless, Cingular, T-Mobile, Nextel, Sprint PCS and AT&T Wireless Services, as well as several state, and federal government agencies, and broadband data service providers.