CELLULAR TELEPHONE FRAUD CONTROL SYSTEM AND METHOD

摘要

Increased security for a mobile telephone system is provided by assigning each mobile telephone unit or authorized user thereof a caller authentication number (CAN) different than the caller line identification (CLI) that is normally assigned to all mobile telephone units. A verification unit added to the conventional mobile telephone system determines whether the combination of the CLI and the CAN identify an authorized user of the system and completes connection of the switching office to the telephone exchange if the CAN and CLI identify an authorized user. The CAN may be transmitted from the caller mobile telephone unit in response to a request from the verification unit, and may be transmitted on a frequency different than the signal frequency, such as the voice frequency.