A pair of security researchers has discovered a number of new attack vectors that give them the ability to not only locate any GSM mobile handset anywhere in the world, but also find the name of the subscriber associated with virtually any cellular phone number. The research builds upon earlier work on geolocation of GSM handsets. The researchers could dump phone numbers, dump voice mail messages, including mobile s handset messages, and then use the same technique to bypass the voice-mail authentication mechanism, they say.
Source: https://threatpost.com/researchers-hijack-cell-phone-data-gsm-locations-042110/73858/