A system for providing handoff for a mobile devices comprising a mobile phone programmed to automatically handover between differing data bearers and to optimally detect those bearers in a roaming environment keeping power consumption to a minimum. Repeating means for these mobile devices to extend the...http://www.google.de/patents/US20050286466?utm_source=gb-gplus-sharePatent US20050286466 - System for providing mobile VoIP
