A number that uniquely identifies a PCS or UPT user (universal personal telecommunications service user) and is used to place, or forward, a call to that user. Note: Before the full implementation of UPT service, the use of the term UPT number may, in some contexts, be subject to misinterpretation. The personal number is a UPT number, and is the basis of the personal mobility aspects of PCS. The term is provided as an alternative term for use where appropriate to avoid such a misinterpretation. Synonym PCS number.