Apparatus, and an associated method, for facilitating call connection with a selected service center from a mobile node. A mobile node is provided with short dialing codes used in a network with which the mobile node is registered by SMS messages sent thereto, such as pursuant to registration procedures. Values of the short dialing codes downloaded to the mobile node are stored at a storage location, such as at a SIM card, indexed together with corresponding codes normally used by a user of the mobile nodes, such as the codes used in the home network of the mobile node. When a user places a call to a service center, the stored values are retrieved, and transposed, if needed, to ensure better that the call to the selected service center is successfully completed.