Apparatus (58), and an associated method, for facilitating delivery of network-specific dialing codes to a mobile node (12). When a mobile node (12) is registered to a network part (18) of the network infrastructure of a radio communication system (10), a request (62) is generated by the mobile node (12), requesting download thereto of the dialing codes used in the network part (18) to call service centers (42) associated therewith. The requested dialing codes are downloaded to the mobile node (12). And, the downloaded dialing codes are indexed (68) together with the dialing codes normally used by the mobile node (12) to call the corresponding service centers (42). Subsequently, when a call is placed to a service center, the dialing codes are transposed (74), if necessary, to permit the call to a designated service center (42) to be completed.