1. A mobile device, comprising: a transceiver configured to tune to a first non-preferred carrier associated with a first network or a second preferred carrier associated with a second network; a table containing information related to the first and second networks; and a processor configured to: tune the transceiver to the first non-preferred carrier; register with the first network over the first carrier; and periodically attempt to tune the transceiver to the second preferred carrier only if the information in the table indicates that the mobile device may be within range of the second preferred carrier.