How hackers eavesdropped on a US Congressman using only his phone number

A US congressman has learned first-hand just how vulnerable cellphones are to eavesdropping and geographic tracking after hackers were able to record his calls and monitor his movements using nothing more than the public ten-digit phone number associated with the handset he used.
Read more: http://snapzu.com/kxh/how-hackers-eavesdropped-on-a-us-congressman-using-only-his-phone-number