Phone giants store callers' private data

By Peter Svensson, The Associated Press

A document obtained by the ACLU shows for the first time how the four largest cellphone companies in the U.S. treat data about their subscribers' calls, text messages, Web surfing and approximate locations.

The one-page document from the Justice Department's cybercrime division shows, for instance, that Verizon Wireless keeps, for a year, information about which cell towers subscriber phones connect to. That data that can be used to figure out where the phone has been, down to the level of a neighborhood. AT&T has kept the same data continuously since July 2008.