Crown Castle Inc. owns, operates and leases more than 40,000 cell towers and approximately 90,000 route miles of fiber supporting small cells and fiber solutions across every United States market. Its core business is providing access, including space or capacity, to its shared communications infrastructure via long-term tenant contracts in various forms, including lease, license, sublease and service agreements in the United States. Its segments include Towers and Fiber, which includes both small cells and fiber solutions. The Towers segment provides access, including space or capacity, to the Company's more than 40,000 towers throughout the United States. The Towers segment also provides ancillary services relating to the Company's towers, consisting of site development services and installation services. The Fiber segment consists of communications infrastructure offerings of small cells and fiber solutions.