A method and system for streamlining the calculation of a rate for a prepaid wireless call is provided. A mobile subscriber can be billed at one rate when she is within her home network and at a different rate when she is roaming in another network or can be billed at a special rate if she is within...http://www.google.es/patents/US8090344?utm_source=gb-gplus-sharePatente US8090344 - Dynamic location-based rating for prepaid calls
