Mobile communication systems

DC CAFC
  • US 6,377,804 B1
  • Filed: 06/11/1998
  • Issued: 04/23/2002
  • Est. Priority Date: 06/24/1997
  • Status: Expired due to Term
First Claim
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1. A method of operating a mobile communication device within a geographical area having overlapping coverage from first and second mobile telephone networks, where said first network is the home network of the mobile communication device and said first and second networks provide respective first and second sets of services in said geographical area, the method comprising registering the device with said first network when a service of said first set is requested and registering the device with said second network when a service of said second set, but not of said first set, is requested.

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