A number of cell phone companies are selling users ' private information to police . Catherine Crump : Wireless carriers have been secretive about their actions . She says the public needs to be informed so that this surveillance technique is not abused . The NSA has a secret program called PRISM, which allows it to collect and store vast amounts of data from American Internet companies. Wireless carriers should tell customers how data is collected , stored and shared .
A number of cell phone companies are selling users ' private information to police . Catherine Crump : Wireless carriers have been secretive about their actions . She says the public needs to be informed so that this surveillance technique is not abused . Crump : Wireless carriers should tell customers how data is collected , stored and shared .