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Porting Authorisation Code
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<p> Porting Authorization Code (PAC) is a <a href="/facts/Unique_identifier/NMcgc7qX">unique identifier</a> (normally 9 characters long and in the format "ABC123456") used by some <a href="/facts/Mobile_network_operator/6Tt5J4TF">mobile network operators</a> to facilitate <a href="/facts/Mobile_number_portability/7VaMVCfs">mobile number portability</a> (MNP). This allows users to retain their mobile telephone number when switching operators. </p>