Abstract: A routing method for a mobile handset message system to facilitate identification of the correct return path for messages initially passing through a gateway from email or other electronic text or graphics message transmission device interfaced customers to message enabled mobile handset customers; the routing method including the steps of: a) providing a routing system associated with a gateway; the system having a predetermined number of output lines each having a different calling line identifying number (CLID); b) identifying the target telephone number for each incoming message received by the system; c) routing each successive incoming message directed to the same target mobile handset through a different calling line identifying number based upon a predetermined pattern of usage in which the calling line identifying numbers are to be utilized; d) storing a return path associated with each calling line identifying number and associated with each message which is dispatched from that number to a targe