Crown Castle

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Crown Castle International Corp. is an American corporation which provides infrastructure for broadcasting and mobile telephony. It operates in the United States, Puerto Rico and Australia. It provides mobile telephone coverage to 92% of the Australian population and 68 of the top 100 markets in the US on behalf of service providers such as 3, AT&T Wireless, Cingular, mmO2, Nextel, Orange, Sprint PCS, T-Mobile, Verizon, and Vodafone. The Corporate office is based out of Pittsburgh, Pennsylvania.

On August 31, 2004 Crown Castle completed the sale of its UK subsidiary, Crown Castle UK, to National Grid Transco plc for $2.035 billion in cash. National Grid Transco plc was renamed as National Grid plc in July 2005, while Crown Castle UK was renamed National Grid Wireless in October 2005.