Possession confidence metric for a wireless communication device

A communication system comprises a voice over internet protocol (VoIP) service system and a location determination system. The VoIP service system is configured to receive a call request for an emergency service from a user, process the call request to determine a wireless communication device identifier associated with the user, and transfer a location request for delivery to a location determination system in a wireless network serving the wireless communication device. The location determination system is configured to receive the location request, process the location request to determine a location of the wireless communication device and a possession confidence metric that indicates a level of confidence that the user is in possession of the wireless communication device, and transfer a location response for delivery to the VoIP service system. The VoIP service system is configured to, if the possession confidence metric exceeds a threshold, transfer the call request for the emergency service for delivery to an emergency service provider that serves the location.