A method, system, and medium are provided for determining the identity of a user associated with a wireless device located near a geographic location at a specific time. In response to the occurrence of an event at a geographic location, a request can be issued by a wireless provider to users of wireless devices to provide the geographic locations of their respective devices and their identities to one or more entities. Upon receiving an affirmative response to the request, the wireless provider communicates information to the entities allowing the entities to contact the users to solicit information regarding the occurrence of the event. A wireless provider may send a request for authorization to users of wireless devices to provide geographic locations when the wireless devices enter a predefined geographic area.