A unique cellular telephone billing system (100) processes call detail records (102) of cellular telephone calls made by users of multi-line customers to produce invoices and reports containing consolidated billing, usage and cost information for the current and other eligible cellular service plans....http://www.google.de/patents/US5027388?utm_source=gb-gplus-sharePatent US5027388 - Method of selecting the most cost effective cellular service plan provided by cellular telephone resellers to multi-line customers
