An apparatus includes a home location register (203) that stores records
for mobile units in a home system (201). A visited location register (213)
stores records for mobile units presently registered in a visited system
(211) in which the visited location register (213) is located. The visited
system (211) identifies a last accessed technology by a mobile unit (221)
in the visited system (211) and forwards the identification of the last
accessed technology to the home location register (203). The
identification of the last accessed technology may be forwarded to the
home location register (203) in a registration notification. The home
system (201) may forward a routing request including the identification of
the last accessed technology to the visited system (213).
