A method and apparatus for providing a mobile station user with information about anticipated roaming charges. The visitor communication system transmits a graded roaming signal to the mobile station user indicative of the anticipated roaming costs. The graded roaming signal is determined by contractual...http://www.google.de/patents/US5862471?utm_source=gb-gplus-sharePatent US5862471 - Method and apparatus for providing roaming indication with charge information
