If the received message is a delete message (which is determined at step 380), then the message switching center 220, at step 382, removes the entry located in the VLR 228 for that mobile 16, and, at step 384, the flag associated with the mobile 16 is cleared (if it was set) so that the message switching center 220 does not send location update retry messages to the HLR 226 for that mobile 16 duri