A monitoring computer (115) monitors a communication resource within a wireless communication system for transmissions by communication units. Upon detecting transmissions, which contains a communication unit personality code, the monitoring computer compares transmission time and location information, stored in a database (117), for the communication unit to determine if multiple communication units are using the same communication unit personality code. If multiple communication units are detected, the monitoring computer reprograms at least a portion of service access information of the communication units. In this manner, discrepancies in communication unit programming may be detected and corrected.