A first authorization system authorizes a mobile device to access over a first wireless network a plurality of services provided by a plurality of service systems. A second authorization system authorizes the mobile device to access the plurality of services over a second wireless network. The second authorization system also transfers location information corresponding to a location of the mobile device to the first authorization system. A first service system of the plurality of service systems provides a first service of the plurality of services. The first service system receives a request for the first service and transfers a request to the first authorization system for the location information. The first service system receives the location information, processes the location information, and selects a positioning satellite based on the location information. The first service system transfers a message indicating the positioning satellite to the mobile device.