A portable cellular phone system is provided, wherein matched sets of algorithmically generated communication units are generated, each defining an increment of authorized communication. One set is stored on a system server, i.e. a service provider, and the pre-paid set is available for use within a...http://www.google.de/patents/US20010000505?utm_source=gb-gplus-sharePatent US20010000505 - Portable cellular phone system having remote voice recognition
