1. A location-aware mobile communication device system comprising: a registration component allowing a first user and second user to register for a location sharing service by validating possession of a respective location-aware mobile device; a configuration component allowing the first user to invite the second user to establish a trusted relationship on a server computer coupled to each of the first and second user; a location sharing component displaying a location of the first user on the mobile device of the second user, when the trusted relationship has been established, and the first user has enabled location display of the first user's respective mobile device on the mobile device of the second user; an external network manager component enabling the first user to transmit the location of the first user to a third user with whom a trusted relationship has not been established, wherein the third user is defined in a contact list resident on the first user's respective mobile device, and wherein the location is transmitted to the third user as an SMS message.