A method and apparatus for fraud control in cellular telephone systems. Call records from a switch are scanned to identify a fraudulent cellular phone based on its behavior. An identifier, e.g., a radio frequency (RF) signature, representative of the fraudulent phone is stored in a control channel editor...http://www.google.de/patents/US5420910?utm_source=gb-gplus-sharePatent US5420910 - Mehtod and apparatus for fraud control in cellular telephone systems utilizing RF signature comparison
