Revealed: How cell phone companies keep data on users for up to seven YEARS Mail Online : "A few data points from the sheet were known outside law enforcement circles, but wireless carriers have not been open about their policies. They aren't required to keep the data, and they keep the same information for varying lengths of time. Some don't keep data at all that other companies store. For instance, it says T-Mobile USA doesn't keep any information on Web browsing activity. Verizon, on the other hand, keeps some information for up to a year that can be used to ascertain if a particular phone visited a particular Web site." 'via Blog this'