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A telecommunications service that provides personal mobility and service profile management. Note 1: UPT service involves the network capability of identifying uniquely a UPT user by means of a UPT number. Note 2: The general principles of UPT are given in ITU-T Recommendation F.850. Note 3: UPT and PCS are sometimes mistakenly assumed to be the same service concept. UPT allows complete personal mobility across multiple networks and service providers. PCS may use UPT concepts to improve subscriber mobility in allowing roaming to different service providers, but UPT and PCS are not the same service concept.