The method of eliminating or reducing cloning of electronic identification serial numbers (herein ESN numbers) of cellular telephones involves programming the phone to generate and broadcast the valid ESN number only under certain circumstances. The method preventing utilizes either a standard cellular...http://www.google.de/patents/US5608781?utm_source=gb-gplus-sharePatent US5608781 - Method of eliminating or reducing cloning of electronic identification numbers of cellular telephones
