Abstract: The method any system for nationwide mobile telecommunications billing provides improved efficiency in billing for mobile services. Local mobile networks are communicatively connected by signaling network to a national mobile service platform (MNSP). Traffic event information generated by local mobile networks is collected directly by the NMSP. Traffic event information generated by local landline networks and long distance networks is also collected by the NMSP. The NMSP processes all traffic events for all calls, generates all necessary billing information and returns resulting billing information to other networks only when necessary. In order to simplify NMSP processing, all billing information collected from other networks is formatted to form uniform master call detail records (MCDR). Each MCDR contains all the information necessary for the NMSP to perform its processing. Each MCDR is rated, then billing information is generated.