Hacker builds $1,500 cell-phone tapping device

A computer security researcher has built a device for just $1,500 that can intercept some kinds of cell phone calls and record everything that's said.

The attack Chris Paget showed Saturday illustrates weaknesses in GSM, one of the world's most widely used cellular communications technologies.

His attack was benign; he showed how he could intercept a few dozen calls made by fellow hackers in the audience for his talk at the DefCon conference here. But it illustrates that criminals could do the same thing for malicious purposes, and that consumers have few options for protecting themselves.

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