UPT is a personal mobility telecommunications service wherein a subscriber/user can register at a terminal on any connected network and be provided with UPT service at that terminal location. This applies whether the terminal is fixed (wireline) or mobile (wireless), and independent of the type of network serving the terminal, e.g. PSTN, ISDN, PLMN. Further in this Recommendation, PLMN should be understood in a broad sense (including IMT-2000).